Savegames missing units on reload

[prospero]

The Ogre video game lets me save games, but when I reload them, no units are visible. The reloaded game also seems to be stuck in limbo between turn phases. The button in the lower right-hand corner which usually allows advancement from one turn phase to another is inactive.

I've tried Googling around to get information on this phenomenon, but haven't been able to find anything. Is this a known bug, or might my Ogre installation be corrupted?