I get the following error message from IE8:

Errordetails webpag

Gebruikersagent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.2)
Tijdstempel: Fri, 25 Sep 2009 00:02:12 UTC

Message: 'ts.p.colModel[…].name' is empty or no object
Line: 10
Teken: 10946
Code: 0
URI: http://xxx/js/jquery/jquery.jq…..rid.min.js

I'm getting the same behavior, but only when the resulting data has 0 rows. Check and make sure that the data your server is returning has more than 0 rows. I already filed a bug about the “0 rows causes Grid to hang on Loading…”