In the FB 8.0.12 and 8.0.14 releases, I'm seeing a JavaScript "Error on page" message in IE8. The details are:
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; InfoPath.3)
Timestamp: Fri, 3 Sep 2010 19:02:05 UTC
Message: 'WikiNavigation' is undefined
Line: 278
Char: 15
Code: 0
URI: http://xxxx/FogBugz/default.asp?W4
I am not seeing this error in Chrome or Firefox.