Emacs crashes when I open a .cpp.file

[William Payne]

Hello, emacs crashes when I open a cpp-file (haven't tried with any other 
files that trigger my c++ language hook). The following message is displayed 
in the console:
This application has requested the Runtime to terminate it in an unusual 
way.
Please contact the application's support team for more information.

[1]+  Exit 3                  emacs read_directory.cpp

I thought that it might be a problem with CC-Mode so I installed the latest 
stable version (5.30.9), but Emacs still crashes. Is there anything I can do 
to track down and maybe solve/work around this error?

I am using the developement version of Emacs, just checked out from the CVS.

/ WP