by min_the_fair » Wed Mar 21, 2012 3:02 pm
It is always helpful in this sort of situation to tell us a little something about your computer, that may help us to understand why you are having this issue, and how to resolve it in your case.
On my computer, I have to right-click the Autohaven document and tell it to open with Applications: Utilities: Java: Java Web Start - but that's not necessarily going to help you, as you are probably not running OS X.4 (I have now told the Autohaven document to always open with that program, so now I just leave Autohaven there and double-click it to open it).