You can certainly try downloading the game from LDW's site and reinstalling, but I doubt that there's a problem with the one you got from Palm Source. You can download v1.1 from LDW's site by clicking here: http://www.ldw.com/zips/vs1_1.zip

Just out of curiosity, what speed were you running the game at? The farm cycle is affected by the game speed, and I wonder if there is something going wrong at certain game speeds or by changing game speed during play?