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I have a similar problem.  With the help of this forum I was able to load My Trails and a portion of Garmin's NE 24K TOPO map onto my Oregon 600.  They show up as separate maps on the gps.  The TOOPO works fine by itself, but when I turn on My Trails the background color blocks all the details of the TOPO.  Normally lakes show up as white, but with the My Trails they are tan.  I can see some elevation detail as well.  I assume it has to do with transparency, but can not figure out how to change the effect.