Hmmm.. We haven't seen that yet. Is that PHP error on a blank white page, or is that a Joomla Notification (in a green or red box)?
Also, what version of Joomla 1.6 are you using? All of our testing was with Joomla 1.6.3 as it's the most recent, and by far, the most stable.
Thanks for the report. We're planning to have the 3.3.0 (non release candidate) out later this week, so if we can fix this quickly, we will.