I checked out a copy of Portal 2 from the library, hoping to spend part of Father's Day gaming. Whenever I put the weighted cube on the switch in test chamber 6, my PS3 freezes. I've cleaned my disc off. My Google-fu is weak and I wasn't able to find any info about this kind of an issue. Four or five updates downloaded and installed before I started playing.
Is this a known issue? How do I fix it?