hey, have a strange problem.
Have create a simpel Infopath form, getting data from 2-3 SP list and showing them in Multi-Selection list box.
There is a master block (Multi-Selection list box).
That control the query for 2 details (1 Multiple-Selection list box and 1 DropDownList).
When i test the Form in InfoPath it work fine, but when i deploy it to Sharepoint 2010 (beta), the master (Multiple-Selection) can not uncheck.
Have tried to remove my rules and other stuff, but still does not work. The 2 others MultiSelect work fine.
Everything else works fine also submit and there is no problems in the Designer Checker

Using Infopath 2010 Beta on a SharePoint 2010 Beta
Also posted on http://social.msdn.microsoft.com/Forums/en-US/sharepoint2010setup/thread/e5b7f3d2-2547-43e1-9172-9615fb743598
Thanks Jesper