Swf which reads rss feed works with firefox, not with IE (sometimes). Why?

Here is the scenario. I made a swf that takes a rss feed and displays the recent posts. I order to bypass sandbox issues, also used a php script to load data across domains. Works like a charm in firefox every time, but only intermittently in IE. Is there a way to fix this? Below it the link to the swf, thanks in advance for any help.

Kris

http://westwoodchurch.net/MDO/rssfeed.swf