File Open dialog, and SaveAs dialog won't open

After working for a while in the ide of BCBldr5 (lastest patch) I cannot
open a file or saveas. These dialog boxes will not open.  When I try to exit
BCBldr5 will ask whether I want to save, I respond OK, however nothing saves
and BCBldr5 won't exit.  So I have to exit and re-enter work from last save.

Any suggestions.