I recently upgraded my openui module to the newest version available from open ui and now I'm having some problems with my store. When i try to open up the admin screen it just sits there and does nothing. I checked with openui and they are sure it's a server side problem but my other miva store without openui is fine? Is there a problem with using openui on my hostmysite store?

This is a problem that has been documented on OpenUI's website, and they have already released a patch for it. If you upgrade to the very latest version (released earlier this week) the problem should be resolved.