The Google Maps issue is a known issue if you are on a BES AND have an Application Control Policy on your account on the BES. There is no workaround as of yet without removing you from the Application Control Policy.
You can download and install an older version of Google Maps:
HTML Code:
http://www.google.com/gmm/apps/v1.6.4/L1/gmaps-BlackBerry-8320_v4_2_L1.jad?make=BlackBerry&model=8320%20v4%202&ver=v1.6.4&dc=Web_exp02
The link is case sensitive.