It does sound like that is the problem. I recently installed 10.7.3 and as a result haven't been able to run the original NXT-G software. For a while.
On a side note I have gotten leJOS up and working on a different machine (running 10.5.
and have gotten nxjflash
to work just fine. Now I am having an eclipse problem where it wont install the plugin. But that can be left for a different post.
Although I'm not out of the woods yet, I've still made some progress and I want to thank you both for your help.