Does the mapping work for you if you use keyboard instead of mouse?

Also, I see you're mapping non-localhost domains to the local folders. Could you please check the new workspaces (available on Chrome Canary) work for you?

I've tested it by hiting "enter" on the keyboard instead of clicking with the mouse and it's no working.

After the update for v.57 all of my co-workers are dealing with the same problem.

Is the error reproducible for yout?

Not working on locahost too.

On Google Canary 59.0.3067.0 if I'm doing right does not work as well.
After I have add and allowed the folder, the files looks like "disabled", and the option to map to network resource do not appear.


It's becoming painful because since it broke, we have reinstall Chrome everyday at work to avoid this update.

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	Captura de Tela 2017-04-10 às 19.54.44.png 117 KB View Download

I'm having the exact same issue. I'm able to map Sass files but not CSS files. Everything was working perfectly before updating to Chrome 57.

Do I get it correctly that you try to establish mapping between local files and deployed website?

In this case, the mapping won't work if the files you try to map differ from each other: style.css, which was served from your website, differs from style.css, which you have locally. 

I'm doing a skin for a e-commerce platform. So my .css is saved via platform admin.
I've being working this way for almost 2 years and works perfectly until Chrome 55.

I don't have acesses to the filesystem where the website is being served.