@Carring Thanks for the report and OpenGL information for both PCs – this is exactly what I needed.
The report from your 2nd PC (the one that exhibits the bug) shows that it is AMD Radeon, and it has “Buggy Pure Shader Pipeline: True” flag. This is a flag we removed in April, along with some related fixes for AMD Radeon GPUs. I didn’t make a proper news post about it, though mentioned it in posts Win64, LCL, simple shapes - something got broken - #35 by michalis , The new version cannot display text - #11 by michalis .
So, this may be a good news: Just upgrade to the latest CGE, Download | Castle Game Engine , and the bug may be gone 
If after upgrading, the bug will remain, please
- Post again the “OpenGL Information” generated using the latest CGE.
- We will likely need a simplest testcase to reproduce the issue.
Indeed I want to fix it – I want CGE to work reliably on 100% of machines (this also means that, even if something is a bug in video card drivers – we want to workaround it, so that it’s not visible for CGE programs).
This may or may not be connected to one of issues @eugeneloza mentions, we’ll see
Thank you!