Did you guys fiddle with /etc/ttys or the way to start X?

This looks like the know problem of X and the process on console fighting  
for input because they are sharing the same virtual terminal device.
Normally there's no getty(8) process attached to ttyC4 so that X can attach  
to it (and xdm isi configured to use vt05 - which corresponds to ttyC4  
since VT numbers in X start at 01). If you activate a getty(8) process on  
this VT too, X will not find a free one and attach to ttyC0 anyways causing  
problems if you have processes trying to get input from ttyC0.

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