Hi,
If U in the planet-overview mark some planets in the "Take credits"-chekbox and then click on the collect credits button., U get a blank screen. I have tested it serval times just to be sure.

Game: Beta-server

Looks like you only get the blank screen if you run out of turns while taking credits or there are enemy sector defense in a sector.

I will add a message for when that happens.

Should be fixed now. You should be able to see all kinds of information when you collect credits from that screen.