This started working on IE 9 - I'm not sure what I updated in the config section when I was going through the site, but all of a sudden it started working again. I do know that before I upgraded the profile was set up not to collect dates, but after the upgrade it was showing the date. I went into the config to shut this backdown. Whether or not this changed something I don't know. It's no longer reproduceable on my end however.

Could not reproduce either. A lot of users have had Javascript caching problems on upgrade (the browser will often aggressively cache old Javascript for a while - emptying browser cache and restarting browser usually helps).