My solution was to edit these two rescuetime .server files...
/usr/lib/bonobo/servers/rescuetime_tracker.server /usr/lib/bonobo/servers/rescuetime_notifier.server
and edit the location in the third line of each from "/usr/bin/rescuetime..." to "/usr/local/bin/rescuetime..."
This is on Lucid 32-bit, but might be the same issue you are having.
My solution was to edit these two rescuetime .server files...
/usr/lib/ bonobo/ servers/ rescuetime_ tracker. server bonobo/ servers/ rescuetime_ notifier. server
/usr/lib/
and edit the location in the third line of each from "/usr/bin/ rescuetime. .." to "/usr/local/ bin/rescuetime. .."
This is on Lucid 32-bit, but might be the same issue you are having.