Hi, We've uncovered an peculiar application compatibility issue that I'd appreciate any advice or guidance on a root cause. Apps that target API Level 21/23 and attempt to hide the system UI via setSystemUiVisibility do not redraw themselves to the new bounds available. I made a simple Android Studio project that only uses the example Android code: Example project (with screenshots) https://github.com/sourcex/AndroidAPI23NavBarIssue setSystemUiVisibility example: https://developer.android.com/training/system-ui/immersive#java The issue is reproducible on Celadon 9, 10 and Android-x86 9.0-rc1 We have been testing Celadon against NUC6CAYH devices. It does not occur on any emulator (phone or tablet) nor a sampling of physical phones and tablets. This was reported to me in an existing application, but was fairly simple to reproduce. Thanks, Bernard