[CentOS] Why is my default DISPLAY suddenly :3.0?

Fri Apr 26 00:03:07 UTC 2013
Joakim Ziegler <joakim at terminalmx.com>

I'm on Fedora 6.3. After a reboot, some proprietary software didn't want 
to run. I found out that the startup script for said software manually 
sets DISPLAY to :0.0, which I know is not a good idea, and I can fix.

However, this still doesn't explain why my default X DISPLAY is suddenly 

Joakim Ziegler  -  Supervisor de postproducción  -  Terminal
joakim at terminalmx.com   -   044 55 2971 8514   -   5264 0864