Hi,
yep looks strange in IE, Chrome looks good, Safari on Mac looks good, FF on Mac looks good
The error, there is an validation error in this line:
/* Tables and forms changed to fit the flyout rev me */
#content table {border:1px solid #000; border-collapse:collapse; line-height0em; width:95%; margin:0 0 25px 0; padding:0;}
Thats what I see in your Andras01.css, the line-height is missing the column (:). However probably not the cause of your problem.
I am checking in IE9 in compatible mode, where sub-buttons have a transparency?
Btw just checking your CSS and you did not try the last version I uploaded, because I gave the complete menu a different name .menu ul etc became .flyout_menu ul etc. I tried here, IE9 gives some problems but it s beta. Anyway IE8/9 is picking up the "if IE7 properties" so it s there the issue. I will make a test site for this cause I am trying to pay some debts to Modx (very bad attempt) and see if Stu Nichols can check this. Frank.