Thank you for trying out the build and letting me know! I greatly appreciate your understanding in all of this!
While there is a possibility that the issue is tied to Unity on Windows 7 or your GPU, I'd still like to try to see if I can find a fix. The fact that this is happening for you consistently after the puzzles reload lead me to believe there's a strong chance that this is a something I could fix.
Is there any chance you could upload and send a zipped copy of your "C:\Users\username\AppData\LocalLow\JadeusGames\Bewildebots\" folder to joesycalik@jadeusgames.com? The output_log.txt file and the "Crashes" sub-folder should be the most important data
And just to ensure I have exact steps to reproduce the crash, does loading 5x5-01-07 and running into the walls consistently cause this crash for you (right turn, move forward)?