Fine, that's what I use but I have a big issue with mine, if I select a county and hit Ctrl + Shift + W ( or select Web Properties from the top menu) it only opens the Web Links dialogue which of course is the wrong dialogue window, for example it only allows "on click" events & no option for "on roll-over" so I don't think I'll be able to help you with your problem but I've looked at it closely and can't see anything wrong with the file.
Bookmarks