Hi Mark,
This is kind of one of those you have to see it problems. You have tried all of the normal things to fix it so I am at a loss of what it could be. Would you be able to email the site url to me? If not, we can probably set up an online meeting with Skype or even Yamisee. I would love to help, I just need to see the site so I can troubleshoot it a little better.
-Joe D.