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I've somehow managed to get the JavaCC to state, when it, once invoked, just display "Please wait" forever (until escape), but neither exception is thrown nor background processing is going on. Sorry but I don't know how to reproduce.
Petre N., once in this state, what happens if the CC window is escaped and redisplayed again by Ctrl+Space? Would it happen again or would it continue to operate normally? Did it happen after the file got opened or in the middle of working? Petre F., could you please try to reproduce? Thanks.
IIRC it was the same for subsequent invocations. I had to restart the IDE to fix it. It happened after about half a day working with the IDE.
OK, I think it happened to me recently as well but I did not have any clue how to reproduce. I'm wondering whether this will become fixed by merging meta_stavbicka into the trunk - adding reference to issue 42068 tentatively.
Should be fixed along with issue #46941 If you will reproduce it again, please reopen, thanks.