Try yanking and reinserting the battery. Also, I live in NY city, and sometimes it takes awhile to get a lock. Strangely, once it locks once, it will then lock quickly all day. I am running revision .55 of os 4.5.
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I couldn't tell ya... i installed 4.5 on my bb and gps works just fine... though I use telenav because i found out that telenav wont work now... so yeah... drunk so sorry