I use google maps with no problems on my 8700g.
I would wait for a few more suggestions on your problem, but see no reason to upgarde DM or the device OS and would think about trying the View Document link resolution. Not sure what to do about your password. If you get it fixed I would recommend doing regular backups. I do one a week and keep the last five.
I am no expert but the View Document link fixed a different error code for me. The link is to the Blackberry Internet Site. I haven't had much luck with ISP or Manufacturer telecons. They seem to have predetermined answers and don't think on their feet.
Again, wait for a day to see other suggestions that may be from more expert users.
Phones Owned: Nokia 6200; Nokia 6126 2ea; 8700g; 8900; Carrier-Cincinnati Bell: Future Bold Owner