Then reflash the rom again - you will not lose your data - select the update zip. Maybe rom issue - no harm trying. I am also on same rom - did not face such issues

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Added on May 3, 2011, 10:51 pm
Are you using the latest KIES ver 2.0 ?

if it is .zip .... then flash it via CWM
if not then need to uninstall the old maps.apk using system installer & have to do adb push to the system/app

I flashed mine with the stock GB 2.3.3 rom using odin & then flashed the CF-Root
---> http://forum.xda-developers.com/showthread.php?t=1073854

then uninstalled gmaps and replaced it with gmail 5.4.0 navigation enabled