the 'clear/wipe' reinstall worked perfectly.. and corrected BOTH my problem with Maps and the problem with Nav.
That's great news.
Just out of curiosity, could you outline for us the complete steps you went through when flashing this ROM (what ROM you were coming from, what process you used to flash this one that caused the problems, etc.)
I'm simply curious since a complete wipe is generally not required. I'm not having any problems, but your experience and solution might help somebody else who is.