Segmentation violation

[Jaime Perry]

What causes are there for segmentation violations?  A client of ours 
just sent an email with screen prints of about 10 different segmentation 
errors all of which occurred  while navigating  their menus.   The 
errors are happening on random  menus and with different key strokes.  
Most of the errors are generated when they hit "X" to exit a menu but 
some happen when hitting other keys to enter a menu option.  They are 
using Filepro 5.0.07D4 on a SCO Unix box (version 5.0.7).

I do not see any problems with the menus and the segmentation errors 
seem to have just started within the past week or so.  Any ideas on 
where to look will be greatly appreciated.  Thank you.

Jaime Perry