Well, I experienced something similar. I restored a saved game and was stuck, couldn't move at all. Restoring again didn't work, the only way to solve the problem was restarting the game and restoring again. Funny thing is my little roach was in a different place on the screen. I didn't have this problem in my previous playthoughs. So far it has happened twice, near the spider and near the high-wire act (no immediate danger there).
I finished the first part of the crawlthrough and will post my comments later today.
