I've read in a few threads that on beta OS 4.5 (1) people are having problems with google maps, and (2) AT&T people are having trouble with blackberry maps.
I have solutions to both problems. Tested on an 8820 running 184.108.40.206 and 220.127.116.11 and an 8310 running 18.104.22.168. Even thought Google Maps and BB Maps overlap to a large extent, I like to have both applications working on my device -- google maps has better search capability, bb maps can be set to track up
instead of north up, so it's better for navigating.
1. Google Maps. The issue reported is that the application hangs after you give it permission to access the radio information. Eventually, the app times out, and it's never usable. I experienced this as well. The solution I found is to downgrade to 4.2.2, install and run google maps, make sure it works, and then upgrade to 4.5 and let BB manager back up all databases, etc. This carries the permissions over and will allow google maps to run.
If this doesn't work for you here are some OTA links for an older version of Google Maps that will work (no cell triangulation, though):
2. BB Maps. The issue is that the version of BB maps that comes with 4.5 requires a service book, which at&t refuses to push down (or, more accurately, pushes down blank service books). The solution, of course, is to load an older version of BB Maps. Replace the LBS.alx file with the file from a 4.2 installation and copy all of the modules (cod files) with "lbs" in them from the 4.2 installation to the 4.5 java folder. Then run app manager.
EDIT: After upgrading my 8820 from 22.214.171.124 to 126.96.36.199, then installing BBMaps from 4.2.2., I got an error message "Maps is disabled" when trying to open BB Maps. This was because the rogue AT&T "blank" service book was pushed down to my device after I upgraded, but before I replaced the 4.5 version of Maps with the 4.2.2 version. The solution is to uninstall BBMaps, delete the rogue service book (Options>>Advanced>>Service Books>> delete the one that says Blackberry Maps), then reinstall the older version of BB Maps.