If I had to guess (and I do), it's: http://www.java.com/en/
I'd say that's most likely a damn good guess. Pogo is a Java heavy site. I keep it updated on my mom's rig so I know it had the latest version., maybe it was a bit behind the IE9 ball.
@ Philly:IIRC, Pogo is owned by EA Games. Ever try to get support from them? They update when they get damn good and ready. Not once did they respond to e-mails about problems she's had with the site and she's been a paying member for years.
As long as she's happy with IE8, I'm leaving it for now. I can't afford many 50 mile road trips when mom can't play Pogo and get her badges.