[Plugin: NextGEN Gallery] Gallery funky since PHP Upgrade

Really happy with how this gallery works – or how it did.
I just upgraded my godaddy hosting account php from 4 to 5 and the gallery does not function the same. Thumbnails jump around when you roll over them and the large version of the pics open in a plain browser – no extra display features, like arrows, black background etc. Is there something I have to rewrite or upgrade – or does the gallery not work with php 5?
Thanks.