Hello! I seem to be getting this error at random:

"Upload Error: <date> Validation-Working-Set-Score-Screen-Fail"

I have no idea what's causing it

Have you set any custom game variant settings? From what I've seen, trying to lock any Color settings, along with several others can stop the map from publishing and generate this error. It's mostly trial and error, you just have to mess with it if it is the problem.

Remove your variant.
Generate Defaults
Remove all but 1
Alter that variant, but don't alter the races. (I hear that bugs them)

Try to do this with modifying as little items as you can, the more you change, the more likely it is to mess up.

I didn't set and variant settings. I did mess around with color and unit settings though. Anyway, after doing small changes at a time before publish I haven't gotten this error again. Thanks guys!