I checked the settings>version it says
Full Version Build No 1.21R
I tried reinstalling it, if I don't enter the unlock key (to unlock the demo version), it works fine. The game closes down fine. After I put in my key, any time I try to close the game, I always get that error. After that error(when you try to exit the game), it freezes for maybe 2-3 seconds, then closes. I haven't heard anyone else have any issues. The problem doesn't really worry me :) I thought it might be something to look into.
Thanks for getting back to me :)
Cool game by the way. Great to get some Aussie developers dev'ing PDA stuff. I'm tinkering in PDA dev myself, I think I'll leave it to the pro's :)
-Merc007- down under