Yeah to me it sounds like that one is conflicting. By any chance you had installed julia using homebrew or some other method? Can you try and uninstall that one?
It somehow starts Julia with a file parameter => julia tries to open a julia script file called +release~x64 instead of running the specified version of julia. Seems to be some kind of a bug.
Perhaps you can try to add it again with
juliaup add release~x64
afterwards in the same shell try again
julia +release~x64
to see if there is something which gets lost when restarting the system. I can’t check because I don’t have a Mac. pinging @davidanthoff
This definitely looks like there is a non-Juliaup julia on the PATH (namely in /usr/local/bin/julia) and that is being called when you just type julia instead of the julia that comes with Juliaup. You can try type juliaup, see where that is installed and in that same folder there should also be a julia, and that is the one that needs to launch.