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Likely somehow cycled, since I have to kill the IDE to get rid of 100% CPU consuming. It happens to me during Exception Reporter windows was displayed, when trying to file another exception. Not sure if related. Attaching log.
Created attachment 69875 [details] ble.txt
Is it random? When did it start to happen? Could you attach a messages.log? Thanks.
Since there's at org.openide.text.CloneableEditorSupport.reloadDocument(CloneableEditorSupport.java:1447) I've tried to reproduce by having an exception reporter opened and forcing reloading of the document opened in the editor by doing an external modification but it did not trigger the problem. Closing as worksforme please reopen if the problem reapears.