Reaper plugins crashing Cubase 6.0.5

Hi, ever since I upgraded to Cubase 6 Artist some select plugins have instantly crashed the program upon inserting, plugins like Electri-Q or the Reaper suite that worked perfectly in Cubase LE 4. It’s been a consistent problem throughout every update of Cubase 6 that I’ve used, both x32 and x64 versions. Searching the internet has shown that it isn’t just me, but I haven’t found any solutions. Does anybody know what I can do to work with these plugins again?

Which OS?

Windows 7 Professional, 64-bit.