I've got a couple toons that one of the professions, engineering, will not launch when I click the button. I've dragged it to other slots and it won't open. I've reset the bars and it still won't launch. Same thing on another toon with the tailoring profession. I've tried playing with the button script. The strange thing is, that after I have opened the profession from the spell book and close it, it might open it with the action bar icon. Just not every time.

I found a workaround:
/run local p1, p2, arch, fish, cook = GetProfessions(); local n, i, sLvl, max, numAb, spoffset, skillLine, skillMod, specId, specOffset = GetProfessionInfo(p1);C_TradeSkillUI.OpenTradeSkill(skillLine)

I resolved this myself. I removed the ablility from the bar and then logged. Adding it back after relogging seems to be working.

Well, that's annoying. I don't suppose there's another way to launch professions other than the /cast macro.

After testing this all day, it's still not working. i've found it not working on several of my toons with professions. I even created a separate action bar to test with. It works at first but after awhile it quits working. I'm not sure exactly when it quits. All I hear is a click that it's sounding like it's trying to do something. I'll keep trying to get you more details to work with.

This is a bigger issue than just neuron. Blizzard made macros will also sometimes fail to open the profession window from what I can tell. It seems like a client issue tbh. I'll keep looking into it though