Whenever I try to compute a forecast in CRM I get the following error.

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; InfoPath.2; MS-RTC LM 8)
Timestamp: Tue, 1 Sep 2009 15:16:01 UTC

Message: Object expected
Line: 582
Char: 1
Code: 0
URI: http://crm.zoho.com/crm/potentials/EditForecast.do?actionType=Edit

Also it does not save the fact that I change a potential to "Commit" or "Best Case"

Any help?