Did you do a reset and re-scan when you installed X3 and again when you installed Platinum? When dealing with 3rd party plug-ins, especially VST3, SONAR may not know they're there unless you tell SONAR they exist.

Anderton
Did you do a reset and re-scan when you installed X3 and again when you installed Platinum? When dealing with 3rd party plug-ins, especially VST3, SONAR may not know they're there unless you tell SONAR they exist.

 VST3 are often in the common files folder.  I have yet to tell a DAW where to look for VST3. As for 3rd Party VSTs I keep 32 and 64 bit in different folders.  All 32 bit go in C: (x86) folder.
 
 I have run into problems like this when I had 32 and 64 bit Sonar installed. You couldn't keep separate preferences in both version. I had this also happen when using Soundforge or Acid because I didn't pay attention to the VST installation and they dump both bit versions in the same folder.  They can't use 64 bit.

Anderton
Did you do a reset and re-scan when you installed X3 and again when you installed Platinum? When dealing with 3rd party plug-ins, especially VST3, SONAR may not know they're there unless you tell SONAR they exist.

yes, I reset and rescanned both applications. They are sharing the same folders. I thought I mentioned that much. Sorry if I wasn't more clear.
 
Should I remove the registry entry after resetting the VSTs too?
 
Didn't have this issue until recent updates to SPLAT. Don't know which one though. I think this is a direct issue with SONAR Plugin scanning and not my install of the plugins or locations of them. The Melodyne and Nectar plugs have not had any maintenance since install many months ago. I rescan often, almost weekly to test other plugin installs into the same place every time.
 
I am only using 64 bit SONAR X3 and SPLAT. 
 
Since I am not alone with my issue, it would be nice if the bakers could check into this issue. I know for sure I have noticed it for the last 2 updates. Do I need to call TS?