I know this is been on the forum but I will ask anyway.  I purchased ezdrummer 2 update and after I installed it and opened a previously created project I found that I can no longer hear or work with any other softsynths in the project (like tts).  ezdrummer 2 essentially  shuts down all other softsynths in old projects.  Is there a fix for this?  I haven't been on the cakewalk site in some time but it seems like they are no longer offering support for x1 owners.  So I guess you have to pay for the upgrade to get support.  Typical for software companies.  Does anybody have a fix for this.  I am using sonar x1 producer with windows 7 64 bit.  I have never had this happen before and it is aggravating especially when I see that sonar no longer supports their product.  I don't care how old a product is, the manufacturer should always try to offer some support.  Of course I am sure that toontrack is pointing to sonar and sonar is pointing at toontrack.  This is an unacceptable thing to happen being that sonar x1 came out before ezdrummer  2 and it should have been tested to work on every daw possible.

maybe this will help http://forum.cakewalk.com/FindPost/3045236

Thanks i checked it out but it didn't help.  Unfortunately I have found out it is a cakewalk issue.
 
The problem is quite simply that EZDrummer 1 had 8 stereo outs and EZDrummer 2 has 16. For some reason Sonar can not deal with the updated EZDrummer changing its number of outputs. Every other host that Toontrack supports works and does not have a problem with this. 

Maybe a session drummer 2 user can confirm the situation here on whether it works at X1D and X3E at their end for 16 outputs.
 
> the manufacturer should always try to offer some support. 

Assume you have installed X1D patch. Sorry but X1 is out of support and you can't expect software companies to support complex products forever (think of the costs involved having to support several versions of Sonar along with other peoples third party code to deal with), it probably works fine on X3E (you could try the trial to confirm this which is X3D I think). Upgrades are $120.00 and in effect you are then back in support. Or you might hang around for X4 (release date unknown).
 
The good news is that X3E has killed a ton of bugs although you may wish to check here (post #1) to see if any of the outstanding bugs with X3E effect you. It may seem a lot but it's significantly less than what X1D had under Roland. Cakewalk is now owned by Gibson.
 
Cheers...

CakeAlexS
Maybe a session drummer 2 user can confirm the situation here on whether it works at X1D and X3E at their end for 16 outputs.
 
> the manufacturer should always try to offer some support. 

Assume you have installed X1D patch. Sorry but X1 is out of support and you can't expect software companies to support complex products forever (think of the costs involved having to support several versions of Sonar along with other peoples third party code to deal with), it probably works fine on X3E (you could try the trial to confirm this which is X3D I think). Upgrades are $120.00 and in effect you are then back in support. Or you might hang around for X4 (release date unknown).
 
The good news is that X3E has killed a ton of bugs although you may wish to check here (post #1) to see if any of the outstanding bugs with X3E effect you. It may seem a lot but it's significantly less than what X1D had under Roland. Cakewalk is now owned by Gibson.
 
Cheers...

Quite what Session Drummer has to do with this thread eludes me, but maybe I misunderstand..
 
As to the OP - I tried to post earlier, but the forum software must have messed up again.
 
The only work-around is to re-assign all the soft synths.
 
Cakewalk have said that they are looking into this, but I have not heard anything since.
 
Toontrack have not even had the courtesy to reply following a request for more information.  I would not rush to blame Sonar for this issue.
 
Some Forum members have flagged this as a minor issue that just involves re-assigning some synths, but it can be a real PITA.  I can only assume that they only run simple projects without many Soft synths.
 
Yesterday I opened a Big Band project that needed a few minor tweaks, and had to be sent off quickly.  Every instrument in the orchestra was a Simple Instrument track of different instances of Dim Pro and other synths.  Each SIT needed splitting.  Then I had to work out which synth it needed routing to, re-assign them, etc.  Many, many times..
 
It took half an hour, and much stress, to do a two minute job.  On one project.  The alternative is to uninstall EZ2, which I like.
 
 

This is the thread I started about the issue.
 
http://forum.cakewalk.com/Problems-after-installing-EZdrummer2-m3035781.aspx

jb101
Quite what Session Drummer has to do with this thread eludes me, but maybe I misunderstand..

Well obviously I got my knickers in a twist and quoted the wrong product.

To save you some time reading posts, here are the serious issues that I had with EZD2.  They have have been reliably replicated by technicians at Sweetwater, so it is not something unique to me.
 
• Open a project that was created with EZD1
• Open the EZ Drummer GUI in the synth rack.  Do anything.  Close it or leave it open.
• You will lose either 1-audio from one or more soft synths or 2-the entire project
• The soft synth audio MAY be fixed by correcting the INs and OUTs on the synth track; HOWEVER,
• This bug breaks freezing and unfreezing so 1-you can't freeze synths and 2-synths that are frozen can't be unfrozen, meaning you can't fix the messed up INs and OUTs.
• If you lose all project audio, you may get it back with a reboot or the project may be corrupted forever.
 
Example:  I opened an old project that had EZ Drummer 1.  The bass (Kontakt) wouldn't play.  It was frozen.  I couldn't unfreeze it and therefore couldn't fix it.  Another instrument (Fab Four) wouldn't play.  I fixed it by changing the INs and OUTs which had been set to random things that didn't make sense.  They needed to be set back to receive MIDI, send MIDI to Fab Four, and then send the audio to the bus.  No instrument would freeze. Then I lost all project audio and it never came back.  Project is ruined.
 
Toontrack says it is waiting on Cakewalk to respond, but Toontrack is not updating forum entries or responding to requests.  I hear nothing from Cakewalk.  I don't know if Cakewalk believes it is their issue or not.
 
I completely uninstalled all versions of EZ Drummer, then reinstalled EZ Drummer 1.  So far so good, but I lost a project and the money I spent on the upgrade—and many hours of frustration.

Thank you, Konrad, for explaining the problem so well. EZdrummer 2 has some innovative new features, and I've been wanting to upgrade. It would definitely enhance my creative process. At the same time, I have many works-in-progress with EZdrummer 1 and cannot afford a major malfunction. 
 
For now, I'm putting the blame on Toontrack. They're the ones that upped the number of outputs required from the host program without making sure existing projects weren't affected. As a longtime EZdrummer user, changing the number of EZdrummer outputs was never something I would have voted for. It's one of those "added features" that many of us care nothing about, while it ruins our past work with the original program. Cakewalk can't be held liable for the decision of another company. 
 

konradh
To save you some time reading posts, here are the serious issues that I had with EZD2.  They have have been reliably replicated by technicians at Sweetwater, so it is not something unique to me.
 
• Open a project that was created with EZD1
• Open the EZ Drummer GUI in the synth rack.  Do anything.  Close it or leave it open.
• You will lose either 1-audio from one or more soft synths or 2-the entire project
• The soft synth audio MAY be fixed by correcting the INs and OUTs on the synth track; HOWEVER,
• This bug breaks freezing and unfreezing so 1-you can't freeze synths and 2-synths that are frozen can't be unfrozen, meaning you can't fix the messed up INs and OUTs.
• If you lose all project audio, you may get it back with a reboot or the project may be corrupted forever.
 
Example:  I opened an old project that had EZ Drummer 1.  The bass (Kontakt) wouldn't play.  It was frozen.  I couldn't unfreeze it and therefore couldn't fix it.  Another instrument (Fab Four) wouldn't play.  I fixed it by changing the INs and OUTs which had been set to random things that didn't make sense.  They needed to be set back to receive MIDI, send MIDI to Fab Four, and then send the audio to the bus.  No instrument would freeze. Then I lost all project audio and it never came back.  Project is ruined.
 
Toontrack says it is waiting on Cakewalk to respond, but Toontrack is not updating forum entries or responding to requests.  I hear nothing from Cakewalk.  I don't know if Cakewalk believes it is their issue or not.
 
I completely uninstalled all versions of EZ Drummer, then reinstalled EZ Drummer 1.  So far so good, but I lost a project and the money I spent on the upgrade—and many hours of frustration.

I will test this later.  On my system, EZD1 and EZD2 Demo are completely separate installs.  Why is it that opening an old project with EZD1 would be affected if you are not launching it with EZD2?
 
Not saying there is not a problem, but can't you continue working in old projects with EZD1?  And use EZD2 for new projects?