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I'm using Mathematica 11 on Mac. When I start Mathematica and create a new notebook then do some simple calculation like 2 + 2 and press Shift+Enter, it continues running and never stops. The title of the notebook is Untitled-1 (Running...) then. I can use Abort Evaluation menu item under the Evaluation menu to abort the operation. But after that I still can't do any calculations and the symptom is exactly the same. I have to stop and start the local kernel in order to use it normally. Anyone can help to point me the problem? Thank you.

J. M.'s missing motivation
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Just a learner
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  • If you have not done so already disable the suggestions bar and try again. – Mr.Wizard Sep 23 '16 at 02:20
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    @Mr.Wizard, I disabled it right now and it still the same. – Just a learner Sep 23 '16 at 02:23
  • Okay. After carefully making a copy of your configuration files the next step would be a reset as described in http://support.wolfram.com/kb/12464 -- please try that. – Mr.Wizard Sep 23 '16 at 02:26
  • If that does not work please report this to official support; it may be a packlet problem like (92931) – Mr.Wizard Sep 23 '16 at 02:32
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    I think I found the reason. I unchecked "Run kernels at a lower process priority" under the "parallel" tab of the Preference panel and suddenly it works. – Just a learner Sep 23 '16 at 03:04
  • You might post that as a self-answer. I wouldn't have thought of that as the cause. Do you have another continuous background task running that would occupy your CPU and leave Mathematica waiting? – Mr.Wizard Sep 23 '16 at 05:38
  • @OgrishMan That sounds strange, as parallel kernels aren't normally used for this. Instead of changing the process priorities, make sure that "Launch parallel kernels" is set to "when needed". Also see here: http://mathematica.stackexchange.com/a/57674/12 – Szabolcs Oct 20 '16 at 21:52

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