So SD is nowhere in Plugin Manager - included or excluded - but the DLL does exist in one of your VST scan paths?   If so, that is really weird...   I can't think of anything else to try under those two circumstances other than to install SD to an entirely different folder (directly under c:\ if possible) and try adding that new path to your VST scan.
 

did you try what I told you in the other thread ?
this worked for me, it took about 10 minutes to do.
 
do you still have X2 installed ?
try using the session drummer 3 from your X2 installation instead of the x3 installation.
remember custom install and only select session drummer to be installed.
 
PS- you need to remove all of session drummers contents (sample, sfz, vst and all.)

Has anyone found a full fix for this. Have problem on laptop and desktop - on laptop managed to get it working with X2 install of Session Drummer, on desktop now completely gone and unable to fix.
 
Please Cakewalk, help us out here!
 
Would not mind if it was a plugin I don't use, but have been using this (and bought add-on kits for it) so have quite a bit invested in it.
 

Platinum Samples
You may need to run regsvr with the DLL name.
 
Rail

That only works for DX(i) plugins.  SD3 is a VST

This is the second time this exact issue has happened to me and the first time I remember finding the solution fairly quickly but this time it was harder for some reason lol.  Thank god for my tenacity because I certainly lack in memory.
 
Here it is:

 
 
go to the link in the above website:
 
 
and download the appropriate file and it literally takes seconds to download and when you reboot Sonar everything is golden.  Hopefully I can save some other people a lot of grief.
 
Jim

Awesome Jim
This is the second time this exact issue has happened to me and the first time I remember finding the solution fairly quickly but this time it was harder for some reason lol.  Thank god for my tenacity because I certainly lack in memory.
 
Here it is:
 
 
 
go to the link in the above website:
 
 
and download the appropriate file and it literally takes seconds to download and when you reboot Sonar everything is golden.  Hopefully I can save some other people a lot of grief.
 
Jim

what the ?
glad the link was removed

Post more often, links are allowed after about 25 posts or so or post the URL in a way the parser does not recognize the link as a URL for example instead of http://cakewalk.com use http:/ /cakewalk.com

If this https://www.cakewalk.com/Support/Knowledge-Base/2007013357/Session-Drummer-3-is-not-being-recognized-by-SONAR-X3 does not work, contact tech support. This is a user forum, do not expect tech support to address issues directly on the forum.

This work!!!! I lost session drummer when I installed Windows 10. Did what you say and its back. A creative solution :)) Very cool!!

Possible Solution Found:
Apply this patch:
www.microsoft.com/en-us/download/confirmation.aspx?id=30679
re-boot if necessary
 
Then
Fire Up X3 -
GoTo Preferences -> VST Settings
Check Rescan Failed Plugins and Rescan Existing Plugins
Click [Reset] - and let the VST scanner do its thing
UnCheck the Rescan Failed/Existing checkboxes and click OK
Now check the SoftSynths and see if old SD3 isn't available now....
 
Sorry not more detailed - am tired from fighting this all night - but I finally got it back
Hope this helps someone....CE
 
PS - I lost SD3 after the Windows 10 upgrade - this is what got it back...

After upgrading to Windows 10 Pro 64bit I found my Session Drummer not able to be used in X3. The procedure in this article fixed it for me and Session Drummer is back! https://www.cakewalk.com/...recognized-by-SONAR-X3

Open SONAR x3
and Create a New Project.
Go To:
> INSERT
> Soft Synth
>VST2
You should see in the VST2 "Drop-Down" menu:

• Session Drummer 2
• Session Drummer

Open "Session Drummer" and you should see that this is in fact.... Session Drummer 3