I had exact problem, found a workaround.
Go into your main fubar options (rightclick action bar/click fubar at top left side of box that opens up).
There you should have an option for 'Thickness', I think the default is five. Setting this to 3 sorted it for me (after trying a couple of settings).
Only does it now when I log a toon on for about 2 seconds, then it is plain sailing.
P.S. love the site and the plugin. Keep up the good work people.