When you run designer with "-graphicssystem opengl", the about dialog has slightly corrupted text. Resizing the window to an even height makes the text rendered correctly, but resizing it again to an odd size demonstrates the problem. When using the GL1 engine (-graphicssystem opengl1), there is still corruption but the text instead appears blury.

This feels very much like there's a slight offset being applied to the texture coords in both the GL1 and GL2 engines and the GL2 engine is using GL_NERAREST and the GL1 engine is using GL_LINEAR, however this is just a guess.