I also have the Full Image Blank Screen prob
I am also experiencing the blank screen full image problem ever since upgrading to 4.1.
It is not only in Internet Browser, but also when viewing images stored on the BlackBerry. It seems to occur only with larger images---both jpgs and gifs.
I emailed Verizon about it exactly a week ago, and today I got a reply: download the 4.1 software again, and see if it still happens.
I don't know if this means they updated the software---it still shows 5/5/06---or if they just think I screwed up the install somehow.