title: Unable to open a windows form during debugging in VS2010
body: <p>I am debugging a windows application in visual studio 2010, the application was developed and upgraded from .net framework v2 and VS 2005.</p>
  
  <p>Originally, windows forms could be open on debugging mode. However, several times later without editing (as I was just tracking possible bugs before fixing), those forms become unable to open. Whenever, I tracked the bugs until the code which shows the form, then the debugger will just stop tracking without any messages. Does anyone know what problems could cause this situation? Thanks a lot.</p>