Somewhere down the road something got mixed up. Trying to get to know what that was could be a very long trail on error adventure. Maybe the best solution is to reinstall verything from ground up again, I know not really desirable but I know from past experience that a reinstall takes 1 day and the troubleshooting can fill up months of your time. I run the full TRacks suite and a lot of Amplitude custom shop in 64 bit with no problems, in fact the IK Multimedia seems the most stable plugins for now on mine system.
Win8.1, 3930K@3.2Ghz, 32GB with Cubase 7.5 & artist 7.5, wavelab 8 elements, HSO, RND Portico 5033, MR816X+Focusrite pro 26 IO, Adam P22a + sub8, CC121, Cubase IC pro, Halion 5, VG2, Arturia AF, TRacks CS grand + all custom elements, BFD3, Amplitube 3 (fender, orange, SVX collections, slash), HSO library, Fender Jazz basses, MB octaver, fender bassman 100, Orange AD200B, MB TTE500, TECAMP, Fender & FMC 12 cabs!