Strange behavior in unity 2d

[Tom Masterson]

For reasons unknown my computer locked up to the point of requiring a hard 
reboot.  I have since then done a proper shutdown and brought it back up. 
Both times after restarting keys in unity like alt-tab and f10 and some 
others do not work.

Any ideas on what is wrong and how to fix it would be greatly appreciated. 
I do not see any obvious errors in syslog or dmesg.

Thanks
Tom

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