Created attachment 154068 [details] The presentation file I've tried many configuration to isolate this bug. On my laptop with LG wide Screen connected via HDMI, the attached presentation couldn't be displayed! The screen stay white with black borders left and right as presented in attached picture. If I invert the main screen with wide screen (through Impress panel), the laptop screen diplay the presentation and the wide screen show information (like current and next slides). I'm under Windows 10 Education, 12GB RAM, Core i5 (64 bits), etc. Never have this problem before with other monitor. I've to do some other tests to see if it works with classic monitor on LO 6.3.1.0 (my current version).
Created attachment 154069 [details] the snapshot of wide screen
Created attachment 154070 [details] Other tests with 16/9, 16/10 and 4/3 screen display on 21/9
21/9 seems to be not recognized 2560x1080 pixels
Confirmed using LO 6.4.0.0.alpha+ (f04a861f07d91a46ce9048e9de0bdd6def5c6a0c) / Windows with 2560x1080 resolution.
It seems to be in relation with OpenGL, because the bug is affected when OpenGL is desactivated. If I enable it, the presentation is OK.
Created attachment 154366 [details] Workaround = activating OpenGL
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