I too ran into the refrigerator magnet glitch. One of the posters on the Tech Issues topic on BFG forum did figure out a way to get past this. Am going to try later. Hope BFG has a quick fix for this glitch.
P.S. Noticed the Hancock Building in the magnet picture.
Update: Tried the suggestion from BFG forum and it worked. Clicking on the X in the upper right of the puzzle window to close it as soon as you complete it and notice the sparkles, enables you to move forward without the game locking up. Just be sure to take note of the number code before you do so.