I cannot edit my post so here is a mod to the statement above.
I saw the sticky post regarding the build server error caused by unwanted characters in the project name. I have a project name with a + symbol in it which I was able to compile yesterday.
Today the Builder servers would not accept the + symbol. Renaming the project files fixed the issue, but at a loss as to why it wasn't an issue yesterday.
The build servers were updated in the past 24 hours and one of the many changes had to do with validating project names to avoid issues with bad project names. There should be a build error indicating the source of the error, if that is not the case, please let me know so we can get the error list updated.