Here are easy steps to reproduce the issue:

- emacs -Q
- Execute the following lisp commands (for example in the scratch
buffer):
  - (require 'imenu)
  - (global-set-key [S-mouse-3] 'imenu)
  - (semantic-mode 1)
- Open a C++ file (or type the following in a new C++ file):

==============================8<------------------------------
class foo {
  void a (void) {}
  void b (void) {}
  void c (void) {}
};
------------------------------>8==============================

- Then play with the menu (S-mouse3 + mouse1). It may work for a
short while (0 to 5 times), then it stops going to the target with
mouse1 although it still goes with return.

	The bug happens with Emacs version 23.4.1 on 64 bits and 32 bits
ArchLinux. It does not happen on Windows with the packages from
EmacsW32 (neither the patched version nor the vanilla version).

		Jerome
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