Since I've upgraded to Ubuntu lucid and emacs23, Emacs pops up the debugger in situations, where emacs22 does not.

For example, when hitting C-c C-c in org-mode, emacs22 simply states can do nothing useful at this location, whereas in emacs23 the debugger shows up.

 Debugger entered--Lisp error: (error "C-c C-c can do nothing useful at this location")
   signal(error ("C-c C-c can do nothing useful at this location"))
   error("C-c C-c can do nothing useful at this location")
   org-ctrl-c-ctrl-c(nil)
   call-interactively(org-ctrl-c-ctrl-c nil nil)

That only illustrates the pattern -- the behavior is not limited to org-mode. Occurring every 3 minutes, it really annoys me. How can I prevent it?

I've already tried to stop this using debug-on-error and stack-trace-on-error: it didn't work.