>When I try to build a new app I get invalid project file. I've chosen the cleanup option but that doesn't seem to do any good. Short of constructing a new project file is there anything else I can do.
Been there, done that. It's usually easiest just to start a new one. Almost all your components will be automatically pulled in on a build, anyway.
The Anonymous Bureaucrat,
and frankly, quite content not to be
a member of either major US political party.