For the last two days, I've been working through a problem wherein my project build .exe had somehow broken (the build had been working, but I made a number of changes around files/internet access/xml). I didn't see any problems running in the debugger, but when I built the application, I received a series of "The VI is not executable errors and a broken start button.
I've been in discussions with National Instruments concerning possible sources and was successively localizing the offending vis (this is a pretty big application) (including their own known bug workarounds ... no luck).