can not "save as" in same folder - error "file protected ... or in use"
Since a while (might be since update to macOS Sierra 10.12.x) I can not save a PDF with a different name into the same folder. An error message appears:
"The file is either write protected or in use by another user. Save the file under another name or in a different folder"
(original message in German)
I can save in a different folder. When I open that new file, do a change and "save as" with a new, third name the same error appears again. I can save as in any other, even in the folder of the first original PDF. So its not a matter of folder rights.
When I open a PDF and want to optimize it than nothing happens when I simply save. I have to "save as" and select a different location.
Acrobat 10.1.16 | macOS 10.12.3
Any hints appreciated!
