Well, there is small bug in DbgView.exe which caused serious problem to me. It happened earlier, but I was blaming my code. Recently same thing happened to me again, so I decided to investigate, and found simple bug in DbgView.exe which causes system "hang", so I made patch to fix this issue. More details can be found in readme.txt which is included with patch.

http://deroko.phearless.org/DbgViewPatch.zip