Mac App Store Validation is still broken?

Ever since upgrading to Mavericks, I have been unable to get the ‘Mac App Store Validation’ option to work. Each time I build and run my app, it crashes immediately. The player.log file contains a single line of junk characters.

19466-playerlog.jpg

Does anyone know what’s causing this and how to get it to work? I am currently running Mavericks 10.9.1 and Unity 4.3.1.

I am experiencing the exact same behaviour on Unity 4.2.2.f1 and Maverick.