I emailed Xara with the problem of the drop-down menus being out of position, and they replied the next day with this. I hope this helps anyone with the same problem. I haven't tried it yet though. If anyone found it works, let us all know!

"There is a problem in Safari where the Xara menu is wrapped in an absolute DIV. Try removing the absolute DIV and using another layout method such as putting the Xara menu in a table cell."