I have the same issue.
memory_limit set to 64MB!
I get an error message in IE8 on the bottom of the browser:
Webpage error details
User Agent: 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; .NET4.0C; .NET4.0E; MS-RTC LM 8; InfoPath.3; Zune 4.7)
Timestamp: Wed, 1 Dec 2010 10:50:48 UTC
Message: Object expected
Line: 482
Char: 1
Code: 0
URI: http://dashboard.wordpress.com/wp-admin/index.php?page=estats&blog=17952361&noheader=true
Message: ‘isRtl’ is undefined
Line: 1
Char: 3843
Code: 0
URI: http://s1.wp.com/wp-admin/js/common.js?ver=20101116
