Just to be clear my "test" project was created in X2a with EZD1.
I made some changes to the routing in TTS and took it out to the Studio a second time.
EZD2 loaded everything correctly, as did TTS.
I have not, as yet, opened any other "old" projects.
Wish I could help.
T

I had to go back several years to find an EZdrummer project with multiouts but I can reproduce your problem.   
 
Just to check something out, I went and found some Studio One projects with the same multi-out EZdrummer and other soft synths present and there was no routing issues present there.  I don't recall seeing this in Pro Tools as well but I hopefully can find a PT project prior to the EZD2 beta so I can check it out there also.
 
Regardless of that, I'm sure the issue will be important to Toontrack and it has already been noted.  Hopefully the SONAR team and the EZdrummer team can get together and find where the communication problem is.

@modNod - it's not just projects with EZdrummer using multiple outs, it's any project createdwith EZdrummer1 in out - stereo or multi out. All the soft synths are routed to EZdrummer.

@ Tom - I wonder if it's a VST thing, as TTS-1 isn't VST, is it? Thanks again for. You help and input - much appreciated.

@bageu - the only work around is to re-route every synth. Are you using Simple Instrument Tracks, or separate Audio and MIDI tracks?

Created a new project on the office rig (X2a x86).
EZD1 multi outs
Dim Pro
Rapture
Zeta2
took it out to the Studio
EZD2 did indeed "grab" all the outputs.
Closing this project "crashed" x3e.
Zeta2 did not "play" so I deleted it.
Project still "crashed" on closing.
Interestingly enough Sonar did NOT create a minidump either time. ??
Opened the project I had moved out there yesterday, and tracked and mixed some with NO problems.
It worked fine!
Opened an "old" project, all synths were "frozen" in that one.
Un-froze (is that right?) EZD1, and EZD2 had everything "right" with the multi-outs.
Only "issue" there is the disabled "bleeds", I had to go into the mixer and fix that.
I don't like "bleed", that's what gates used to be for.
 
I'll be out of town the next two weeks, will have to troubleshoot the crashes then.
I DON'T believe that was an EZD2 issue.
Zeta2 has been wonky since I install x3e, maybe before, I don't use it alot...
 
T

Thanks, Tom.  I think it is probably a global issue.
 
I've emailed Cakewalk and Toontrack support.
 
Toontrack replied within 24 hours, which is amazing, considering how busy they must be straight after the release.  Admittedly it was only to say they didn't understand what the problem was, so I've sent them a screenshot.
 
I don't expect to hear from Cake for a while yet.
 
In the meantime I have laboriously gone through the projects that I need to work on and reassigned everything.
 
Sometimes the multi outs of EZ are assigned to other soft synths, so I've had projects where SI Bass, Rapture, Dim Pro and others are all assigned to EZ, and EZ HiHats are assigned to SI Bass, Snare Top to Dim Pro etc. etc.
 
What a mess.  I've not had the crashing problem that you have had, but I have had some strange graphic issues with the ProChannel being blank in the Console View.  Everything just seems a mess.
 
Thanks again, Tom, for your help/support/interest.

I've not heard back from Toontrack support, and not heard anything from Cakewalk support yet.

JB101 - please keep us all updated on progress with this.
 
I was about to purchase but will hold off until I hear back on this.  I have all kinds of track templates and current projects built with multi outs and definitely do not want to have to re-do all this.
 
JR

Yes keep us updated. Watching this one.

Toontrack was great and reached out to us on this thread. We just got a few NFRs yesterday. 
 
jb101, one of our guys spent a bit of time last night trying to reproduce but was unable to. Can you PM me a link to a project file that exhibits this?

Thanks, Ryan, I have sent you a couple of projects.
 
To see the issue you would have had to have start a project using EZdrummer1, then installed EZdrummer2, and then opened the project.
 
It doesn't matter if you used multi out or stereo out.
 
I just checked possible meanings of NFR - I assume you mean "Not For Resale" rather than "Nude Full Reverse Massage"?   Mind you, they are Swedish..