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This is a known issue http://world.episerver.com/support/Bug-list/bug/FIND-1073
Can you please upgrade to latest version of Episerver Find to fix the issue?
Could this or a related issue with some script that wasn't online possibly affect the edit mode?
We had issues where the a click on "show properties" button in editmode took forever (several minutes) to show the properties.
And that issue was gone shortly after this script became online.
I have two pages where the file https://dl.episerver.net/12.2.4/epi-util/native.history.js gives a 404 errror.
Does anyone else have the same problem?