Shared memory on Redhat9

[Gera]

Hi there,
 
I've installed redhat9 on P4 computer, updated all the installed packages using redhat network tool, installed postgresql, php and apache. After changing shmmax to 500Mb both gnome and kde are crashing at different times. Did anyone have similar problems and how could I fix it?
Thanks in advance.

		
---------------------------------
Do you Yahoo!?
Friends.  Fun. Try the all-new Yahoo! Messenger