Pressing the “Save” button to save some apex or SOQL from the tool windows is causing a lock up after selecting the folder, naming the file and clicking “Save” (or even “Cancel”). It is almost as if there is some ‘hidden dialog’ open somewhere as clicking anywhere on any open project sounds the ‘bell’ as though its got some modal dialog waiting for a response - but it's invisible. I’ve tried moving all of the windows out of the way in case its hidden, but can’t see anything. I don’t know what has triggered this to start happening. The only way to get it working again is to kill-off and restart IntelliJ Idea.
Unfortunately the idea.log reports nothing while doing this. The immediate workaround is to cut/paste text from these tool windows into another external editor and save it there. I will also try rebooting shortly to see if it comes right as a result of doing that.