Please describe the problem:
I have a search folder for all unread mail on a certain set of folders.  If I try to read this mail one by one, the message preview pane works fine.  But if I double-click any mail item (or press "Enter" while selected on any item), the message window will appear, but will be blank.

If I simply clear the search filter (Shift+Ctrl+Q), and then double-click the item, it will open properly.

Steps to reproduce:
1. Search for unread mail. 
2. Double-click any item (or press "Enter" on any item)
3. Notice blank window


Actual results:
Blank window

Expected results:
Window with message contents

Does this happen every time?
Yes

Other information: