Hello. I just stumbled across an issue with the Mirror Effect in Buildbox 2.3.7. In short, if you use the Mirror Effect, it works great in the BB Preview (looks amazing), but unfortunately it causes crashes on real devices. I can't confirm Android, but this happens using Xcode 10, on iPhone XR. The error thrown is something along the lines of "Thread 1: Signal SIGABRT". It seems others have already found this problem here on the forum, but I thought I'd share it again. Maybe this is an old issue, but this was the first time I've tried using this effect. I have since removed all the Mirror Effects from my BBDoc, saved a new version and re-exported and it's working fine. So don't worry if you're experiencing this. Just remove them and you're good to go