The problem is that the code expects document.all.spVersionsTable to exist, but it doesn't.
I've been ignoring this one, since it is only a problem for admin. I think this is probably a problem no matter which browser is used. I searched through the code for spVersionsTable, and cannot find this element added to the document anywhere.
I have now reported the cause of this bug, along with two possible fixes.
http://simpleportal.net/index.php?issue=401.0 Using the default theme (I only have simpleportal, AEVA media 1.1b, and PDF Tag installed) I get.
Webpage error details
User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; MDDS; Tablet PC 2.0; OfficeLiveConnector.1.5; OfficeLivePatch.1.3)
Timestamp: Thu, 16 Sep 2010 12:53:02 UTC
Message: Object required
Line: 593
Char: 6
Code: 0
URI: xxx/smf/index.php?action=admin;area=portalconfig;theme=1
That line is:
with (document.all.spVersionsTable)
That function gets added to the onload event to be executed as soon as the page is done loading.