Graphics glitch after choosing some menu options or selecting units/buildings.

[PaweX]

This started happening after choosing some menu options like exit menu, and some buildings (e.g. Shipyard, Forester's hut):

Sometimes happens randomly.

After pressing 'Esc' key, game goes back to normal.

Version: b51b35a5

[PaweX]

Actually it happens when I select nearly anything. I can't play the game. It's b51b35a from master branch.

All game assets are loaded from full version of Settlers III Gold Edition. Game language is Polish. Game worked fine with these settings in c3add12 version.

[PaweX]

It seems it is caused by the new GUI.