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Magento 2.2.5 - category thumb upload - stuck on loading after saving

Magento 2.2.5 - category thumb upload - stuck on loading after saving

I am running Magento 2.2.5.  I migrated from 1.

When uploading a thumbnail to a category, I select the image, press save, and then the page fails to get past the whirling/loading icon, and the page remain washed out and unusable.  

It occurs on all browser, after logging out, clearing cache, reindex, compiled etc.

I haven't touched or edited any core files.

The console reports the following error...

file-uploader.js:74 
Uncaught TypeError: value.map is not a functionat UiClass.setInitialValue (file-uploader.js:74)at UiClass.initialize (abstract.js:73)at UiClass.initialize (wrapper.js:109)at new UiClass (class.js:49)at Object.initComponent (layout.js:137)at fire (jquery.js:3232)at Object.fireWith [as resolveWith] (jquery.js:3362)at Object.deferred.(/admin_1u9idw/catalog/category/edit/key/6bfefd3ede425d7d38ed258f6746c49ffc93015a1417f514ea0773cbf7c503ea/id/165/anonymous function) (http://magento.local/static/version1524775074/adminhtml/Magento/backend/en_US/jquery.js:3461:37)at fire (jquery.js:3232)at Object.fireWith [as resolveWith] (jquery.js:3362)

 I am aware of others who have had this issue and have so far not found a solution.
I am desperate to fix as my category manager is current unusable.

Thanks

1 REPLY 1

Re: Magento 2.2.5 - category thumb upload - stuck on loading after saving

Same in 2.2.2