You need to do FlashVars differently on IE and on the other browsers
FlashVars must be assigned in both the OBJECT and EMBED tags in order to work on all browsers.
Object Tag Example: (Internet Explorer)
<PARAM NAME=FlashVars VALUE="foo=Hello%20Worldgraph=first+line%0Dsecond+line">>
Embed Tag Example: (Other browsers)
<EMBED href="display.swf" FlashVars="foo=Hello%20Worldgraph=first+line%0Dsecond+line" ... (other parameters)></EMBED>