Date: February 18th, 2011
Cate: FDT

Arrow & backspace keys stop working in FDT/Eclipse

UPDATE 29-01-2013

Just got the tip from Sander Schuurman, that it’s even easier to fix this in Eclipse. Just go the Project Explorer, select your root project folder and press F5 (refresh). Arrow keys are working again.

UPDATE 01-11-2011

It’s claimed that this issue has something to do with a mouse button which is stuck (seems to me that Eclipse’s editor view has some buggy mouse listeners). The latest fix that almost always seems to work, is to simply press all your mouse buttons at the same time. Sounds weird, but recently it has always worked.

UPDATE 01-07-2011

Seems that in the FDT4.5 version killing the dock process doesn’t do the trick anymore. Logging in and out is the only fix I’ve found so far.

Every once in a while I’ve got this problem that my arrow and backspace keys stop working in FDT. FDT is a plugin built on top of Eclipse and that’s where the problem seems to be coming from. It’s been bothering a lot of people on Windows, but I am on OS X. The bug is described here on the Eclipse bugtracker.

I’ve been searching high and low to get rid of it, but it seemed that logging out and in again was the only thing that would resolve the issue. But there is a simpler solution:

  1. Start the Activity Monitor application
  2. Quit the Dock process

After that your keys should be working as normal again.


  1. February 19th, 2011

  2. Thanks man, I have this every now and then. Next time I will try this…


  3. Robert R Tupelo-SchneckRobert R Tupelo-Schneck  
    April 25th, 2011

  4. Whew. Thanks for posting this solution.


  5. RafaelRafael  
    July 29th, 2011

  6. Did you try this?
    (Solution on first reply)
    It worked for me.



  7. November 3rd, 2011

  8. Thanks for this. I have a 3-button mouse and I’ve never used the 3rd button. Before reading this article, I hadn’t noticed it was stuck. Getting it unstuck fixed this issue for me. What a relief!

    Thanks again.


  9. March 30th, 2012

  10. FDT
    MacOS X 10.6.8
    the trick “press both mouse buttons” works for me.

    thanks a lot !!! :)


  11. a a  
    August 28th, 2012

  12. pressing left and right mouse buttons worked for me.


  13. AnonymousAnonymous  
    September 30th, 2014

  14. pressing left and right mouse buttons at the same time multiple times - worked for me.
    Thanks :)


  15. Sanket MehtaSanket Mehta  
    September 30th, 2014

  16. Pressing left and right mouse buttons simultaneosly multiple times worked for me. Thanks :)


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