For anyone wondering if X3D fixed the Linplug RMV incompatibility issue - it didn't. They didn't list it as such on their bug fix list, but I very much get the impression (I'm not a coder, so what do I know?) that Cake takes a broad brush approach to resolving VSTi compatibility issues - they dig into their code, discover one or more potential issues that affect one/some VSTI's then slowly close out the problem reports after they hear back from users - efficient use of programmers maybe but not necessarily the quickest way to resolve a particular issue with a particular VSTi, as is the case for anyone trying to use RMV - at least the 64 bit version. (Since I was originally looking for something to replace Phatmatik Pro, I don't see the point of installing the 32 bit version of RMV).
Makes me wish I had gone for Geist instead. (Went for the deal). Not that this is Linplug's fault - X3 broke something as it works fine in X2.
Ah well - it was cheap and I can wait. I'll follow up with Cakewalk on a potential fix.