From MW 1.27 CodeMirror Enable/Disable button doesn't work sometimes.
Are there any errors in the Developer Tools' console of your web browser when this happens?
In the first case error is:
NotFoundError: Node was not found in codemirror.js:5965
trace:
CodeMirror.fromTextArea/options.finishInit/cm.toTextArea http://localhost/~pastakhov/w/extensions/CodeMirror/resources/lib/codemirror/lib/codemirror.js:5965:9 switchCodeMirror http://localhost/~pastakhov/w/extensions/CodeMirror/resources/ext.CodeMirror.js:303:4 addCodeMirrorToWikiEditor/<.groups.codemirror.tools.CodeMirror.action.execute http://localhost/~pastakhov/w/extensions/CodeMirror/resources/ext.CodeMirror.js:234:13 $.wikiEditor.modules.toolbar.fn.doAction http://localhost/~pastakhov/w/extensions/WikiEditor/modules/jquery.wikiEditor.toolbar.js:263:6 $.wikiEditor.modules.toolbar.fn.buildTool/< http://localhost/~pastakhov/w/extensions/WikiEditor/modules/jquery.wikiEditor.toolbar.js:352:8 jQuery.event.dispatch http://localhost/~pastakhov/w/load.php:4669:15 jQuery.event.add/elemData.handle http://localhost/~pastakhov/w/load.php:4338:6
Second is hard to replay...
Hi Pastakhov: we have similar problem on our test wiki which we have just upgraded to 1.28: logged out all is ok, when logged in you do not longer see the button to turn it off or on.
moreover when logged out, the button does not longer change to the black/white color.
If you want to test it on your own in our instances, modify your hosts to use wiki.documentfoundation.org:443:89.238.68.189 or change your resolver. ;-)