The bug can be recreated by going to http://lispclub.com/~vinay/jquery_ie_events_bug.html and clicking 'Offering type' in Internet Explorer, and then the "next" button on the overlay window that pops up (please forgive the styling and lack of problem reduction, in a big hurry.) This is an issue at least on IE 8, but the problem does not show up in chrome or firefox.

The error dialog states (on non-minified jquery 1.4.2):

"A Runtime Error has occured. Do you wish to Debug? Line: 4519 Error: 'events' is null or not an object"

Looking at the stack trace, this is caused by the .empty() on line 72 of jquery_ie_events_bug.html.

I was able to fix this bug by changing line 4519 of non-minified jquery 1.4.2 from

if ( data.events != null) {

to

if ( data && data.events != null) {

This fix was just a hack and I don't know the root cause.

Hope this helps... looks like this could be causing problems for others as well (http://forum.jquery.com/topic/load-using-tabsselect-causes-events-is-null-error-in-ie-urgent-help-needed)