FWIW: I have the same issue with 10.04 (Lucid Lynx). Neither the
revelation nor dictionary panel applets will accept keyboard focus
(i.e., can't type into them) if Visual Effects is Normal or Extra
(System -> Preferences -> Appearance -> Visual Effects). With Visual
Effects set as None, I can type
This has been annoying me also since the upgrade to Lucid. It does not
affect Guest or other users on the same machine.
For me the simplest fix was to remove (or rename, in case you need to
revert) ~/.gconf/apps/panel. The downside is then losing all the other
shortcut icons I have placed on the p