Brian,
Chris will provide the proper fix for the Mac problem with Building
Applications lab in a future beta.
You you could try the following patch to verify that the theory on the
problem is correct:
Open ~system\extras\util\project.ijs
Find line:
f=. wd 'mbopen "',nam,' File" "',p,'" "',xvl,'" ',j
Change mbopen to mbsave, save the file, and close J.
Start J and try the lab yet one more time.
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