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All of a sudden, starting January 10, 2022, the WebSpellChecker (WSC) in a dialog, after clicking on the "spellcheck" under the ABC button in CKEditor 4, stopped working despite the fact that previously it worked properly. As a result, you see an incessant loading spinner. 

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As was announced a year ago, effective January 10, 2022, we disabled the Free Cloud version of the WebSpellChecker (WSC) in a dialog plugin for CKEditor 4. This is the end-of-life for of this plugin. Users that have added WebSpellChecker (WSC) plugin to the CKEditor config.js file using the extraPlugins parameter or still using CKEditor lower then than 4.16.0 may face an issue with the loading spinner.

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To solve the issue,remove the WSC Dialog plugin from the extraPlugins parameter in the CKEditor config.js file (if any) or disable it using the removePlugins parameter:

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