Hi,
I can confirm this. Opening desktop folders with Dopus is disabled out of nowhere. I tryed re-enabling it from Dopus (Although it was already.) And re-installed it with 11.5 version (older was 11.4 anyway but gave a try.) but the problem wasn't solved. Then I removed mentioned update and it is working with out problem. Win 7 x64 here.
Also AndyK had mentioned the same thing here. Windows explorer replaced Directory Opus
That update seems important but one needs to log on locally to use this exploit as it is described in the KB. So if you are the only one that logs on the PC, removing it may not be a problem. But you may consider to fix it since one eventually will install it. 
Thanks...