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I just had a client in using the scope.  He had whole plant leaf mounts.  We did 
some Z-stacks, no issues - but when I went to change the objective to 10 for 
shut down and return the objective to the bottom position -4, the value was 4.98 
mm.  Has anyone run into this before?  Also, when I went to shut down the LAS 
AF program, there was an error about z-drive position was 35789867969 and must 
be between 0 and 254945956569 or something like that.  So i rebooted the 
system, and I cannot get into the LAS AF program because it keep giving me 
error and terminating.  I tried looking online for some help, to no avail. Can 
anyone help?