Description of problem:
After the most recent FC6 updates it is no more possible to move an email by
drag/drop to some folder (on the left side of the thunderbird main window): The
drag symbol is lost when leaving the main window and touching the folder pane.

Version-Release number of selected component (if applicable):
thunderbird-1.5.0.9-2.fc6


How reproducible:
each time

Steps to Reproduce:
1.Open a folder and click onto an email
2.Try to drag it to the folder pane
3.
  
Actual results:
The drag symbol is lost if you leave the mail pane and touch the folder pane 

Expected results:
Can drop it over the folder pane

Additional info: