The official answer is that you need to get the MKIV coded to your car and set to the United States region. That will solve problems 2, 4, 5, and 6. You can also do this yourself with NavCoder.

Problem 2 should come back on its own. The nav computer needs a few cycles of the ignition to detect all of the settings. If it is not back yet, then try disconnecting and reconnecting the battery. That should do it.

I do not have an idea for problem 1. Maybe the coding or battery reset will solve that one too.

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input