Remember the bug where the vehicles would go back to the original position after you saved a game? I reported this to David, and he asked if I could send him a saved game. I trashed the demo and all its saved games when I got the full version. (I haven't noticed whether this bug still exists in the full version, but I haven't yet gotten to "Obfuscation" in the full version.)
The problem was definitely seen in level 3 of the demo with the ferris wheeel over the long spiked passage. Does anyone have a game saved before that passage that you could send to David at help@ambrosiaSW.com. If it occurs in the full version, the folks at Ambrosia might want to fix this first.
Maybe post here if you send - so David doesn't get flooded with saved games?
This is not a bug, just a limitation of the save files. They're a megabyte already, and some things there just isn't space to keep track of -- the positions of the tricycles being one example. The resetting of their positions should not negatively affect gameplay, though.