Same problem here, new download of 1.3.8. I have Twinkle as well, so I blanked my monobook.js and the IE cache VP still didn't load any recent changes.  I then tried 1.3.6, and it worked on the first Update click, and then failed to load any new edits after that first set. Other functions like the browser on the right and loading the admin list worked fine. I'm on IE 6.0 (I'm a Firefox user) - could that be a problem?