GNU Emacs 24.3.1 (i386-mingw-nt6.1.7601)
of 2013-03-18 on MARVIN

Steps to reproduce:

emacs -Q

M-x semantic-mode

open a C++ file, such as foo.cpp

C-c , j

input an existing symbol and press RETURN

it says [No Match]

However, Emacs 23.2 is OK.