Yes, it's happening to me. After a zillion hours of play (seems like it, I can get the exact hours), some of the puzzles were unsolved.

I assumed it was a bug - I think it really has to be. Since it seems to me that it was a bug, I didn't want to continue with the current instance of the game. I wanted to go back to an earlier save. At least 2 times, I restored a backup savegame file, sucessfully. I have backupbuddy, both the PC version and a version that backs up the data on my Palm (Palm TX) to the SD card where I also keep games, documents and stuff. I run Village Sim off the SD card, but the savegame file stays in Palm memory. This last time, I saw the game was bad (unsolved puzzles), so first I restored from the save on my SD card (the SD version of backupbuddy runs every night at 4 AM, and backs up the Palm memory to the SD card). That didn't work - I still had unsolved puzzles. So, then I restored the savegame file from an earlier save - using the backupbuddy restore function on the PC. It still didn't work - I guess my savegame file on April 21 was also bad. I'm going to go back further to see if I can find a good save.

After that - what should I do - restart the game? Do I also need to reinstall? I'd prefer not to reinstall, but if I have to, I will.

Thanks. Oh - I always run the game on easy, with a fast time.