I have an unusual problem I can't find a solution to.
I updated my other desktop computer this afternoon(12.04 32 bit plain-jane ubuntu) which has been running fine for months BTW..
I continued working, surfing the web mainly, and some time later Firefox seemed to corrupt. I was trying to type a email message and misspelt 'next'; 'net'.
I attempted to correct the spelling mistake and insert the 'x' pressed 'x' on the K/B, and next thing the tell-tale 'x' cursor of xkill appeared and was xkill was running! As soon as I clicked on the email (web-based) Firefox closed.
Opened FF again home page appeared (google) typed an 'x' in the search box, same thing happened, xkill running clicked on page killed FF.
Tried this again on the desktop, killed GNOME.
Restarted computer, same thing again.
Shutdown again deleted my K/B shortcut CNTRL-ALT-X for xkill, rebooted again, same thing again.
This time shutdown, tried a new keyboard/mouse combo - same thing.
Help please! This is weird!