Version: gnome-terminal-2.32.0-1.fc14.i686

Steps to reproduce:

1.) # ls -l /proc/$(pidof gnome-terminal)/fd |grep ptmx |wc -l
23

2.) Open and close a tab

3.) # ls -l /proc/$(pidof gnome-terminal)/fd |grep ptmx |wc -l
24

Addition al information:

For me, gnome-terminal usually reaches 1023 open file descriptors after few days of use, which is the default open file ulimit for my operating system. Obvious, though a bit incovnenient, workaround is to launch another gnome-terminal instance at that point.