CentOS - Sep 2015 - Crash when open a terminal after upgrading from centos5.9 to 5.11

Dear all,
I  had installed Centos 5.9 in my x86_64 system and I installed update
yesterday. Just now after I initiated the system, I found it has been upgraded
to centos 5.11. But the bad thing is now I cannot open a terminal. When I try to
open a terminal, it just gives out a bug buddy  window :
"The information about the crash has been successfully collected. Please
provide some background about what you were doing when the application
crashed..."
Could anyone help me about this? Thanks in advance.

Yeping Sun