I have build a project in CS6 and it was working fine until late last night.
When I try to open it, it get to 81% and then stops. The software then crashes if I try to do anything.
I have deleted some of the source file the project it useing but this should not stop it from opening.
Sometimes it goes to 91% then stops.
That usually happens when
a) the media cache is corrupted
b) some source file is currupted
c) an effect fails to initialize
Flush the caches, temporarily remove third-party plug-ins...