Had to restore favicons after win 7 update Rated 5 out of 5 stars

For some reason, all of my toolbar favicons were lost after an auto update of Windows 7 last night. I've been able to restore them manually, one at a time, using the right-click-properties popup. Some of the favicons don't appear immediately after being restored. They do appear after a restart of FireFox. Others appear as soon as the favicon file is selected, while the popup is still open. I thought at first this behavior might be caused by favicon file type or size, since I have a variety of GIF, ICO and PNG formats. However this turned out not to be the case. The behavior seems to be random.

In any case, everything works after a manual restoration of all favicons and a restart of FireFox.

OS: Windows 7 SP 1, latest auto update, 08/30/2011
FireFox: 6.0

Hope this information is useful,
Big Al Mintaka