Sorting columns doesn\'t work in IE

Sorting columns doesn\'t work in IE

FYI... When viewing "Activities", I tried to sort using the "Start DateTime" column. When trying this using Internet Explorer 7 and Maxthon Browser ( http://maxthon.com)-- whihc uses IE as its base. In both browsers I could see the little "in progress" icon but the table never sorted. I tried the same thing in FireFox and it worked fine. I assume you are aware of this issue with IE7 -- is there a work-around other than having to use FireFox?
Rene