I'm trying to make it work again in 1.1.3... the latest VV I found online is v0.7 (but in-game, on RPM it says it's v0.6)
Buttons in the toolbar plugin don't work but I don't care, RPM works but just menus and settings, I don't actually have any real "view" of the vessel
But at least I can interact with vessel parts ( without leaving IVA ) with the "Part selector" which is nice.
What version of Vessel Viewer / KSP are you using ?