I have tried changing the plot color preference but still don't seem to get a surface plot of surface altimeter setting. Sea level pressure appears OK, and upper level appears OK for the pressure surface.
Anyone else have this problem and, if so, how did you resolve it?
To those who may have read this post, I finally got the altimeter setting display to work. Apparently, the problem is that METAR and SYNOP cannot co-exist. SYNOP takes precedence, both as to observations plotted and data analyzed. That is why there was no altimeter setting!
Digital Atmosphere can plot SYNOPs with METARs... most likely each dataset had different times, like 00Z SYNOPs with 01Z METARs. If autotime select was on and there were more synops than metars, the 00Z stuff will appear and no altimeter settings will be seen.