Hey turns out this is a unity error and not a problem I can solve on my end (at least it was for mac and web builds). I have filed a bug report which has been successfully replicated so if we're lucky there'll be a fix in the next update.
Nah no fix yet. In fact I can now no longer run builds of the game on my own computers! Agh! Anyway you can follow the bug here if you like (but I haven't received an update in quite some time).
