I have found that I have to prime the GPS. I did not let custumizations run.
I have been screwing with this for a couple of weeks now. I am on Verizon & flashed the leak & official ROM. I don't want to use Google Maps or Live Search as I do not have a data plan. I want to use TomTom. I did get it to work on both ROM's, well sort of. This is without doing any fixes or hacks. I found that if I run the Holux GPS Viewer (http://forum.ppcgeeks.com/attachment.php?attachmentid=8465&d=1211243109) to prime the GPS then TomTom will work. Sometimes it takes longer than other to obtain a GPS lock & I am talking a bout 5 minutes. The only problem I have with this is this. If I turn my phone off then I have to soft reset in order to obtain a GPS lock again.