Could you please upgrade to the latest FP and see if you still see Action script problem on Internet Explorer?
You can find the latest FP at following location:
You can also download Story desktop version.
Upgrading from Flash 10.0 to Flash 10.1 fixed the ActionScript errors in IE8. (I had the latest flash for Chrome/Firefox, but not for IE8.)
IE8 also doesn't exhibit the behavior of double-entering the first character. (I.e., "bbar", that I mentioned above.)
We have posted a fix for the double click enter issue. Please try out the fix to check that it works for you.