Return, Tab, and Delete keys no longer work

I can't recall doing anything recently (software installs, etc.) to cause this to happen, but those three keys just "bonk" when I try to use them with my eMac G4 1.25GHz
I tried plugging an older apple keyboard from a G4 PowerMac into same USB port and others as well with no luck. I have a belkin USB hub, which the keyboard was plugged into and even tried plugging in the keyboard directly to the eMac, with no luck. All other keys work fine. The odd thing is, it is only iCal, Safari, Mail.app, Firefox, not Terminal or Textmate,
I am stumped. Is there some fix for this??
Thanks for any help
Dennis

1. move or delete ~Library/KeyBindings/DefaultKeyBinding.dict
2. Restart
Silly me - you were spot on - 'TextExtras' is something which had been installed, but which I had binned (because I never used it), only I had overlooked the DefaultKeyBinding.dict file (must have misspelt it when searching earlier).
Everything is once again in order. What's more, VirtueDesktops now properly places Mail and Safari in their respective places. (Whereas all I got from restoring my preferences yesterday was that MenuShade back working on all VirtueDesktop spaces, instead of just one.)
So I thank you immensely - I only needed to wander around lost for that bit longer, until crossing your trail of crumbs once more...
Problem solved.

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Return, Tab, and Delete keys no longer work

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