problem with filmstrip nav bar in WPPA

I saw old posts (1 and 2 years old) with similar problem, appears to be resolved but still happening to me even with updated plug-in.
In firefox and Opera developer, the thumbnails on nav bar display lower than they should. They actually hang down over the Comment bar! It’s ok in opera. What should I do about this, sorry for my english and thank you for helping me with this. I work on local server so I can’t link to my site…