When browsing WordPress (3.0.1) login page with Janrain Engage 0.3.1 using IE8 (on Windows 7), the Janrain login plugin is not displayed there, but only a regular login form.
Also there's an exclamation icon on IE interface telling that there is an error on the page. If clicked, it displays the following:
Webpage error details User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Win64; x64; Trident/4.0; .NET CLR 2.0.50727; SLCC2; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E) Timestamp: Mon, 30 Aug 2010 16:28:09 UTC Message: Unknown runtime error Line: 19 Char: 1 Code: 0 URI: http://blog.picmote.com/wp-login.php
I have also tested this on latest Firefox, Opera, Safari, and the page works correctly with these browsers.
I've also tested it on Maxthon 2 (maxthon.com) browser which uses IE Trident engine. And the same problem is there. Maxthon 3 uses WebKit engine by default but can also on switch on the fly to Trident mode, and when in Trident mode, the same problem persists.
So there is some incompatibility with IE here.