Erm well you haven't included the x64 vc2005 runtime dll (msvcr80.dll) in the plugins pack. So gssoftdx isn't able to load. It's next to impossible to find that file on the web too since it's in beta .
BTW is gssoftdx loading hard coded in? When I remove that plugin the core still trys to load it.
Anyways I'll take a proper look later. However gssoft crashes if you have window themes enabled. I checked this with both the normal uxtheme.dll and the winblinds x64 beta (wblind64.dll), so it's probably unlikely that it's a fault at windows end . Still I thought I'd better mention it in case anyone else gets the same errors .