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After working for a while with Manipulate function and increasing the number of variables to be manipulated, keyboard stops working properly in the Notebook. It gets really crazy, mainly the keys Backspace, Space, Delete, Ctrl, Alt, Left, Right, Up and Down. For example, some times Backspace starts behaving as the Left Key, some times as Right, etc. all this randomly. I am running Mathematica for Linux, and I have had this issue with Ubuntu 13.04 and recently with Ubuntu 13.10 as well. This is not an issue related to my computer since outside Mathematica the keyboard works as usual.

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closed as off-topic by Öskå, RunnyKine, Karsten 7., Michael E2, Bob Hanlon Sep 26 at 16:38

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Googling "keyboard issues ubuntu" yields many problems with the latest releases. My guess is that this is probably not related to Mathematica. –  Sjoerd C. de Vries Dec 1 '13 at 15:52
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I have experienced the same issue where the keyboard keys get randomly remapped all of a sudden (when doing heavy computation). I don't think it's the Manipulate function that is causing the problem since I'm not using that. For me, it's also the letter keys that get randomly remapped, for example, F was remapped to Left key. (I'm on Ubuntu 14.04, Macbook Pro, Mathematica v 9.0.0). –  Zephyrus Jul 20 at 2:51
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I don't think it's an issue with Ubuntu because I can switch back and forth between Mathematica and Gedit and it works fine in Gedit. –  Zephyrus Jul 20 at 2:52
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I have this remapping issue on windows 8 too. –  iav Jul 23 at 18:59
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I have the same issue, though it starts randomly, heavy computations are not needed to trigger it. I'm now using Ubuntu 14.04 and it has increased in frequency. very bizarre. –  Artur Gower Aug 28 at 9:23