Dreamweaver 2017 Sharing Violation

I have a similar issue, and I'm not actually editing the css file that it complains about.  But I'm using sccs, and it's the automagic compilation of scss to css that creates a sharing violation with the css.  Dreamweaver doesn't like the css file being open for editing and also being occasionally updated when I save my sccs file.  And this is even though I DON'T have the css open as a separate file, but only visible as a dependent (i.e. "related") file. 

So, what seems to fix if for me is clicking on the "filter related files" feature and making sure that the css file does not exist as a file I could view as a tab.  That won't help you, if you need to actually edit css directly. I can only suggest doing the same filter thing, editing your css as a separate file (not a tab alongside your source), and closing that editing session when it complains.

I got the same 'sharing violation' message recently.  I posted the problem and received no solutions prior to searching and finding your post.  I seemed to have resolved my problem.  Which, I believe was caused by a combination of saving and putting files to the server and using FileZilla also to transfer changed files to the same.  I messed around doing both to update files the on server and then reloading the index file in DW; which for now has fixed the problem.  Using the DW 'put' command is slower than updating changed files with a FileZilla transfer; but, I believe the "put" command checks all links each time.  It would be nice to hear more about this issue from experts.....thanks

I just ran across this exact problem, and what I did to correct it is to have DreamWeaver run as an admin. This may well not be the ideal way to correct the situation, but it worked for me.

Go to Event Viewer in Windows. There you can see what causes the clash.