I tried Chrome 12.0.742.112 and there was no problem with the browser stalling or the page refreshing correctly - yay!
The browser that is having a problem (just so you know) is Firefox 4.0.1.
One of my problems was that back end and global options would work, but write options -page wouldn't. In Chrome, even though the setting changes would save and the page would refresh, the setting changes would not apply to the editor account. Just for fun, I tried making the changes to write options - post, and it worked! It applied the changes to the PAGE edit screen though. (crazy)
For instance, if I turn off Page Image under Write Options - Page, I can still see the Featured Image box on the page editing screen. However, if I turn off the Post Thumbnail under Write Options- Post, the Featured Image box on the page editing screen goes away.
So it seems I had two problems - one was the browser responding to the "Update Options" button (Firefox bad, Chrome good) and the other problem is Write options for posts applying to pages.
This is using Adminimize 1.7.7 - I used an older version to see if the problems would go away.
My client's site is working now and I have to launch it, so I can't really test with it anymore. However, if you want more help testing, please contact me at kim at cruxwire dot com. I'd like to help - this is a great plug-in and I'm sure you are busy.