VisualStudio 2012 devenv.exe @ 50% F5 Debug wont start until its finished whatever its doing

Question

Help appreciated.

I noticed when pressing F5 to start debugging a WPF app that the green play triangle would gray out then after a second go green again as if debug hadn't started. After some investigation I found that devenv.exe was running hot @ ~50% and the debugger wouldn't start until it came to rest at which point myapp.vshost.exe would be created in task manager/processes and would start to debug.

It can take anywhere from 30 - 120 seconds for devenv to finish whatever its doing and I can begin debugging which is driving me mad.

Ive tried disabling all extensions, restarting Visual studio but they didn't work.

Can anyone cast any light on this annoyance.

Answer 1

VS2012 reinstalled to resolve issue.

Awful to have to resort to this but I couldn't afford the time to investigate.