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The shortcut to add a row to a matrix ("ctrl"+"Return") on my OS X version 11.1.1.0, isn't working. Instead of inserting a new row it just inserts a new line into the cell. Has anyone else experienced this, and does anyone have a solution? I have looked through the "KeyEventTranslations.tr" file and everything is in order.

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    $\begingroup$ I can't reproduce this on my mac, both Ctrl-Enter and Ctrl-, work for me in a matrix cell to add rows and columns, in the same version. $\endgroup$ – Jason B. Aug 16 '18 at 13:55
  • $\begingroup$ Could it be that some other application is hijacking the shortcut? You could try to check in another application whether that specific shortcut works $\endgroup$ – Lukas Lang Aug 19 '18 at 18:11
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    $\begingroup$ I am also having this problem, Mathematica 11.3 on a mac running OS X 10.13.6 $\endgroup$ – Ken Miller Oct 4 '18 at 18:54
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I've had the same issue. For some time I just ignored it because I've assumed that perhaps I've somehow broke it myself by writing custom stylesheets and packages or downloading something. Today though I got annoyed enough to dig deeper and I've verified it wasn't due to any autoloading package or stylesheet. It also didn't appear to be a conflict as I checked the KeyEventTranslations.tr file (at least the user copy copy of it from $UserBaseDirectory, so I decided to switch the shortcut to CTRL+M and all the sudden I have now two working key shortcuts! I'm not sure, but I think it points towards a conflict of redefinition of a sort.

Mathematica 11.3 on a mac running OS X 10.14.1

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I also had this problem and found that removing an add-on, mathStatica, fixed the problem (after a couple of restarts of Mathamatica). However, I suspect that this could be a bug in Mathematica, since clearing the FrontEnd entry in mathStatica's PacletInfo.m also fixed the problem, suggesting a startup issue.

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