I accidentally solved this problem today by trying to validate the XHTML on my site.
It turned out to be a problem with my doctype.
When I changed that to:
Code:
<!DOCTYPE html PUBLIC
"-//W3C//DTD XHTML+RDFa 1.0//EN"
"http://www.w3.org/MarkUp/DTD/xhtml-rdfa-1.dtd">
everything seemed to be run a lot better........