Call list is working fine for me. I can see all the calls I made/received/missed from before the upgrade. Have just called my N900 from another phone, and the missed call correctly showed up in a Yellow alert box, and then in the call log.

However, I didn't think to look in the call log when I was having problems with the conversations app, so I've no idea what that was showing then (but my hunch is it wouldn't have shown anything either)