This problem is indeed caused by installing GTK 3.10 (from 14.04 or
elsewhere).
libgtk-3-0 3.10.6-0ubuntu1~~saucy1 [origin: unknown]
This is the problematic package. Downgrade this package (and other
upgraded packages depending on it) to 13.10 packages and the problem is
fixed. I don't know if this is a problem with the package itself and
also occurs in 14.04 (unlikely) or if it's just the combination of 13.10
and some 14.04 packages.
** Changed in: unity
Status: New => Invalid
** Changed in: unity (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1277888
Title:
In most apps all menu items are gray / unclickable
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