Graphical errors on OS X Rated 4 out of 5 stars

The addon itself would be very great. Unfortunatley it doesn't work correctly on Thunderbird 3.1.7 on my Macbook with Snow Leopard 10.6.6.
If the addon is activated all my HTML Newsletters I receive, get graphical errors. If I scroll down the view of a HTML-email I get horizontal white lines in the Email.
If the addons is deactivated everything is fine. I'm sad, I really would like the addon, but this is a nogo. Please fix this, thanks!

This review is for a previous version of the add-on (2.1.685).