enigmail grabs mouse and does not release it

[Ian Macs]

versions:

enigmail 2:1.4.2-0ubuntu0.12.04.1
thunderbird 13.0.1+buikld1-0ubuntu0.12.04.1
xfdesktop4 4.8.3-2ubuntu7
linux-image-3.2.0-25-generic 3.2.0.25.40

architecture: amd64
release: 12.04

Using the XFCE Desktop.

Steps to reproduce:

Start thunderbird, Inbox listing opens.
In the listing of all Emails, perform a long mouse click (without release) on the subject of an encrypted email.
A dialogue box with title "Open PGP Prompt" is displayed. Release the mouse button.
Type in the passphrase for your gnupg key (does not matter if you get it correct or wrong).
Press enter.
The dialogue box disappears.
Move the mouse without pressing a button.

Observed behaviour:

Mouse cursor changes to Hand with attached sheet of document.
The mouse can be moved but clicking on any mouse button or turning the scroll wheel has no effect.
Alt-Tab (to switch to a different window) has no effect.
This behaviour continues until Thunderbird is closed using Alt-F4 or Ctrl-Q.

Expected behaviour:

Mouse can be used normally and Alt-Tab key combination switches to a different window after the dialogue box disappears.

Possible workarounds:

1 - Release the mouse button before the dialogue box disappears.
Unfortunately, the computer may be faster than your finger.
2 - After the dialogue box disappears, do not move the mouse, but perform another mouse click (press and release) without moving the mouse
3 - Do not click on the encrypted mail in the listing, but on an unencrypted one, and navigate to the encrypted message using the cursor up/down keys.

[ian macs (ianmacss)]

After update to the following versions, the problem goes away automatically after a while, i.e. the mouse pointer with the hand and a document next to it changes back to a normal mouse pointer after a short time and mouse clicks and Alt-Tab work again. Good enough for me.

enigmail 2:1.4.3-0ubuntu0.12.04.1
thunderbird 14.0+build1-0ubuntu0.12.04.1
xfdesktop4 - same version as before -
linux-image-3.2.0-26-generic 3.2.0-26.41

[gf (gf-interlinks-deactivatedaccount)]

Closed per comment(s) above; not a bug anymore.