You consider providing a bit more detail as to what you were doing when you got that message, whether it happens every time, if it appears to be related to something specific (every time I start firefox, I get X), any packages you've changed from the default, etc. .
What you've given us isn't really enough information to provide any functional help.
Jim,
Only thing I did last was a "yum update"... on centos 5 x86_64. This happens every time I reboot.
once I hit the OK button it looks like everything still comes up and runs as normal.
I was hoping that based on the output of the "bonobo-slay" someone might new what to do...
Thanks,
Jerry