Hi Headshaker
What I did was move all the vstsound files from the groove agent folder and put them with all the other vstsound files (which I think might be in the Steinberg/Content folder, ie 1 level up) then when I restarted Cubase, it wanted to know where those files were, so I pointed it to them, then it seemed to work ok. Might be worth a try
Best Regards
Dave