Did he not say that he "knows" where the dll's are, and how to get them scanned?
(looks like I was typing while he posted)
So, here is my experience, I an NOT the norm... but I'm not the only one.
All the IK plugs quit working in Sonar X2 on both my systems x86 and x64.
When they updated TRAckS and Amp3 to 64 bit those 2 worked both x86 and x64 on both systems.
Read that to mean the new x86 dll and the x64 dll worked fine.
Then, Amp3x64 quit working in SONAR somewhere in X3 or early Platinum.
I posted here and at the IK site; Problem Reports, the whole schmear! no joy.
I had to run AMP3x86 with JBridge in SONAR Platx64. Worked fine in SONAR x86, both systems.
Amp4 works fine.
SampleTank 3 fine; but not the VST3 version.
Jeremy, if you want to get the "old" synths working I would try JBridge.
Can I verify that "samplemoog" for instance will work, NO!
I just used JBridge to run Amp3.
Of course all the advice above is worth a try.
But if/when all else fails...
HTH,
T