Matrox g450 refresh

I’m trying to get my Matrox g450 configured under the newest (Jan18 )
qnxRTP. Whenever it I use phgraphx to set the up my card using the matroxg
driver instead of the vesa driver my monitor quickly displays an out of
range message. My monitor supports vertical refresh of 85Hz at 1600x1200
and I’m only trying for 60Hz at 1024x768. It may be that the program is
setting the horizontal refresh too high but I see no option to change that.
Any help would be greatlky appreciated.