that is reeeeally odd. It would pretty much have to be an error in their programming and since their graphics code is quite iffy, that's most likely. I would try using an outside printscreen program like Gadwin Printscreen. It's free, small, and it works. Make sure you configure it to take a screenshot from a different key combination though like ctrl-F1 so the game doesn't continue taking bad ones.
<<banned from SRF for disrespect of the mod team and rules violations. -SG>>