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I just installed the update to 39.0.3 from 39.0. Keyboard unresponsive...

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After the 39.0.3 update on XPsp3, the keyboard is often unresponsive, i.e. the 'alt' key will not bring up the title bar menu or 'cont+n' will not open a new window. It was working fine before the update. Is this a common problem?

After the 39.0.3 update on XPsp3, the keyboard is often unresponsive, i.e. the 'alt' key will not bring up the title bar menu or 'cont+n' will not open a new window. It was working fine before the update. Is this a common problem?

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That shouldn't be happening.

See what happens in the Firefox SafeMode.