From man 7 signal, signal 4 is SIGILL, which gets sent when a process tries to execute an invalid instruction for the current CPU. This copy of X was built for a CPU older than or the same revision as the one that you're running it on, correct?
The other error, "Screen 1 deleted because of no matching config section", initially looked like an identifier problem, but that can't be it...
Oh, I think I see it. Change "leftOf" to "LeftOf" (capitalize the L), and see if that at least gets rid of that EE line.