Everything seemed working fine with this wonderful templateI until I found out...

The drop menu is working perfectly in Fire Fox (mac & win) and Safari (mac), but the drop down menu won't appear in IE (win).

I've reinstalled the original stylesheet, stylesheet-header menu, tpl_drop_menu, but no luck.

COWOA and time zone offset mods have been installed, but I don't know if they are causing this problem.

Has anyone had the same problem?
Any advice would be appreciated.