Urgent menu problem

[rmhatchett]

I have a serious and sudden problem with the menus on http://www.aquatix-2u.co.uk which is a live site.
The second level menus are all appearing towards the top of window, partially hidden under the header. This happens in Actinic itself, Firefox and IE8. I am not aware of having changed anything which might affect this and have imported a snapshot from a couple of days ago and it still doesn't work as they used to.
I have checked out another computer which has a copy of the site on it, which hasn't been updated for several days and it isn't working there either.
I'm running Actinic Business Plus v10.0.3
Any clues as to what is going on would be greatly appreciated, as I don't know where to start.

[leehack]

Pop over to drillpine.biz, buy the norlist addon (£35+vat), install it and 10 minutes later all will be fixed. If you're going to have menus like this, then go with one well supported and with a support forum, Norman's menus come highly recommended and supported and he is an actinic expert. A snip at £35.

[peblaco]

Your menu relies on CSS with absolute position and small changes can affect it. It may be easier to update the menu to a newer one as Lee says.

[rmhatchett]

Thanks, Lee (and Louise). In fact I was proposing this very enhancement to my client before the problem occurred! I guess that's the way to go. I just wish I could work out how it could go wrong on copies of the site that I haven't touched for days. It was fine on the live site less than 24 hours ago.