We've had a few versions of this app on the store, and this is the first time Apple made this complaint... the file /dev/shm doesn't exist on OSX (at least the ones I've checked), but I can see through dtrace that it is indeed trying to open the file (looks like library initialization from the calls around it). This is the first build on this latest version of Unity, so maybe something changed there, or maybe we just pulled a more strict reviewer this time. The string /dev/shm does appear in <app>/Contents/Frameworks/MonoEmbedRuntime/osx/libmono.0.dylib, and nowhere else I can see, so it seems like a Mono thing. Has anybody else seen this? Any known solutions?