I just started using DC++, and I had it running last week no problem.  What I'm running into now, though, is that I can open the program but none of the actual windows (favorite hubs, search, etc) have anything in them.  They're completely blank, so I can't even use the program.  Stuff like settings and all that still works fine, though, it seems to be only the features that create a new tab in the program. 
 
Please help!