When I try to use the experience editor I get an error that causes the loading sign to just keep spinning and it also prevents the Ribbon menu at the top from displaying.
Heres where the error is occuring in the "LargeDropDownButton.js" file
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Have you changed something recently that could have caused this? Added a new ribbon button, changed security on ribbon items, etc. – Dan Sinclair Feb 12 '19 at 17:11
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Have you fixed that already? I have similar issue. – Bartłomiej Mucha Mar 14 '19 at 11:35
I had exactly the same issue.
In my case, it turned out that we had an old version of sitecore\shell\client\Sitecore\ExperienceEditor\ExperienceEditor.js file.
After I replaced it with a new one problem solved.
Sitecore 8.2 u7
