Suddenly I can not edit... anything

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Hi 1st post and 1st C5 install. Checked the forums but could not find a fix to my problem.

I have a local install that was working great. Stopped for some dinner then when I came back to the computer the page was greyed out. I tried logging out and back in but still the same.

Restarted the local servers and tried in various browsers but still unable to edit the site in anyway.

I had only made a few content changes to the site... no code changes so I am baffled.

Can anyone help?

barryfinlay