Since a couple of days I'm running into a weird issue with TeXnic. When I compile a file more than one time in a row the window Server Busy opens up with Cancel grayed. If I click "switch to" the start menu opens up and nothing happens. The only thing I can do is to kill TeXnic and then the process that still runs as a dependence of the "Server Busy" application. The issue occurs with all TeX files I processed, so it doesn't seem to be related to the TeX file itself.
I'm running rel. 2.02 stable 64-bit on Win7 Ultimate 64-bit. I made no change to acrobat or to TeXnic but Win7 recently self-installed a system update.