Att Navigator map display problem in Nav mode

I just got my Impression last week and have been playing around with all the apps..  I also got the data unlimited w/ navigator plan...  

Att navigator works fine in most all cases...
General map display for cities and other areas fine...
enter address and correctly calc route...  but here is where my problem is...

When in navigation mode and the "map" display is on the screen for the route,  only the turn indicator and road names display on a yellow background...  The actual roads DO NOT display...

If you switch to map summary mode,  the map show correctly with all roads and names.  Switch back to nav mode and roads disappear...  This happens in both 2d and 3d map mode.   The turn by turn directions and movement of my position on map is fine also.

It is version 1.2.04 build 1104...  which appears to be the latest update.  ATT support is no help.   I believe there is a bug in the navmap display code when running on this phone...   I also "downloaded" the version again just to check if my program had somehow gotten corrupted...  No change except it did tell me I already had the latest version.  I re-saved anyway to check.

Once again, maps show FINE in general map mode or map summary mode...  only problen when in actual navigation mode.

Anybody else experience this strange behavior?

Thanks in advance...

pasayten