Fall 0.1.3 opens just a white window instead of content when started with desktop resolution 1024x768

0.4.9-RC-27-g39f5e56 gcc dbg
VBox 4.3.40, no additions, VBEMP (and our inbuilt Mesa)

Fall 0.1.3 from rapps

The game starts up fine for me and draws content when desktop resolution is 800x600.

Contrary, when I set the desktop screen resolution to 1024x768, the game starts up too, but draws only a completely white window
whiteWindow.png

Nothing in 0.4.9-RC-27-g39f5e56_fall.log is catching my attention. And yes, I started it multiple times in a row in this log.