have similar problems. Did a manual upgrade from 3.0.4 to 3.1 and lots of AJAX stuff is not working.
*The hide/show arrow on the left side panel for Post, Media, Links etc in the admin area does not work any more.
*The ajax panels on the dashboard no longer load
*Other ajax features such as Create Link icon in the editor fail to load (screen is greyed, but panel never appears)
Have tested from Firefox 3.6.3 and Chrone 9.0.597.102 beta. Mac OS 10.5.8.
I'm getting an error from load-scripts.js, which is minified so it's hard to say what it's doing:
a.attributes is null
http://mysite.net/wp-admin/load-scripts.php?c=0&load=jquery,utils,editor&ver=151e6df801b09d30f43e1a8f2114dea7
Line 55
55b.specified?b.value:Va.test(a.nodeName)||Wa.test(a.nodeName)&&a.href?0:B;return a[b]}if(!c.support.style&&e&&b==="style"){if(f)a.style.cssText=""+d;return a.style.cssText}f&&a.setAttribute(b,""+d);if(!a.attributes[b]&&a.hasAttribute&&!a.hasAttribute(b))return B;a=!c.support.hrefNormalized&&e&&h?a.getAttribute(b,2):a.getAttribute(b);return a===null?B:a}});var X=/\.(.*)$/,ia=/^(?:textarea|input|select)$/i,La=/\./g,Ma=/ /g,Xa=/[^\w\s.|]/g,Ya=function(a){return a.replace(Xa,"\\$&")},ua={focusin:0,focusout:0};`
Rob