I have noticed that my Google Chrome extensions are no longer working on Ubuntu or Windows, and the context menu of each extension is no longer showing up. I have noticed that this problem seems to occur on both Linux and Windows in Google Chrome, so it is most likely not platform-specific. EDIT: The problem has been resolved in Windows after disabling all extensions.
closed as too localized by Jorge Castro, Takkat, Alvar, The Lord of Time, Marco Ceppi♦ Jul 13 '12 at 17:53
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The problem seems to be back now, and it affects my Chrome installation on Windows as well as Ubuntu. I tried disabling all extensions, and everything seems to be working again, at least for now.