Amplitube is a 32 bit app with a 64 bit dll. (LOTS of VST's are; most?)
ONLY SampleTank 3 is a 64 bit app.
The Amp3 32 bit dll works fine in Sonar Platinum x86 on my rigs.
(NOTE: Currently running Dorchester, not Everett; I'm not moving until the drum maps are fixed)
Running Amp3 in Sonar x64 (this goes back to sometime in SonarX3)
has caused constant crashing when closing projects containing Amp3.
Currently I'm running the Amp3x86 dll in Sonar x64 with with jBridge (bitbridge was no help).
Best $17.16 I've spent in a long time!
Frankly I'm not as enamored with x64 as many on the Forum.
But that's a topic for another thread.
Millzy, if your issue is with Amp3x64, check out jBridge.
If you're having issues in x86, I can't help you.
Tom