If I exit the X server via alt-control-backspace, the xterm provided with RedHat 6.0 does not seem to terminate. If I run the 5.2 xterm binary from your XFree-3.3.3.1 it does terminate when the X server goes away (as well as every version of xterm I have ever used in the last 11-12 years). This is a major annoyance. I have temporarily worked around the problem by using the 5.2 version.
You need to install utempter-0.5-2 to fix this problem. An errata is due soon. *** This bug has been marked as a duplicate of 2767 ***