I see that they have made a change on how they handle users in their WP_User class.. Fortunately
PHP lets you overload methods so I think I have figured out a work around. I have only tested this for a little bit, but I believe it works..
Understand that I took some time out of a pretty busy schedule to try and fix this, for free, so if you could PLEASE report back if this fixes the issue you are having with WP 3.3 that would be great.
See attached text file for code replacements and additions.. There are only two)