Hi, 
got both Sonar platinum versions installed but use the 32 bit one most of the time. 
Att the SI instruments do not appear in the 32 bit version. 
I have already checked the plugin manager and the settings and the are all the same - same path set for the plugs and instruments....
Do the SI-instruments only work for 64 bit or did i do something wrong ?
As far as i remember, the SI instruments workes in Sonar X3 on 32 bit....
 
Thanx for your help folks....

There should be 2 seperate dll files installed for each 32 bit and 64 bit version of the plugins.
Each Sonar 32 or 64 bit uses its own plugin scanner and manager.

Can you confirm that the dll files are all installed.

If they work in earlier versions of 32 and 64 bit Sonar the plugins should already be on your system.

Maybe time for a VST plug-in reset/rescan?

Ok - did that rescan thing and it worked :-D
Thank you guys for the quick help !