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There's this, from the Mac forums. (Sierra definitely gives Adobe programs problems.)
TwinuserJun 4, 2017 7:37 AM in response to HuckinAlabama
Hi, this worked for me without uninstall/reinstall:
On Library/Application Support/Adobe/SLStore reset folder permissions to: Read & Write on all users. Apply to all underlaying folders and items.
On Library/Application Support/Adobe/Adobe PCD reset folder permissions to: Read & Write (System), Read only (Admin & Everyone). Apply to all underlaying folders and items.
Restart your Mac and immediately hold down CMD+ALT and P+R (reset PRAM).
Thanks - I'll give it a try. Right now I have all permissions set to read & write for everyone.
OK - I have done everything Steve recommended exactly - then reset the PRAM. Both Photoshop and Premiere Elements opened normally. But they already had after I reinstalled them. I shall see how they behave for the next 3 or 4 weeks and report back. If it goes well beyond a month then I shall uncross my fingers.
A big dud! Steve's recommendation worked the first time after I followed his instructions, but then four days later when I opened PE a second time I got the error 16 message. That was the fastest collapse I can remember. Since then I changed every Adobe permission I could find to allow everyone access. I so far I have used it successfully twice but it is obviously no guarantee. What infuriates me is that after all this time I cannot contact Adobe directly and get technical help - this forum seems to be my only recourse. One would think that Adobe might have recognized a problem with its Elements programs and Mac's system 10. Very depressing.