The one I can remember off the top of my head is the Fstypes option, it is no 
longer supported and if it is in the OPT file, it will cause Dr Watson.  I 
believe we had another non supported option cause the same problem, but I can't 
remember it.  Sorry.  I would review any OPT file you are going to copy and 
question any options that seam out of place. That's how we found ours.