I spoke way too soon! A few days after I got the new computer unit, the same problem happened. Thanks to others on this board who mentioned similar issues, but the REAR AC vents worked, I tried the same test. It appears that it's the FRONT blower. I had to wait 3 weeks again for an appointment with a loaner from my dealer. Just dropped it off yesterday. I told them to keep it until it's fixed.
I got a new Final Stage resistor installed first, no help. Then the new computer (paid the $50.00 charge), no help. I'll post the results when I get it back. Hopefully it will be finally fixed for real, and that info will help others.

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2002 X5 4.4i | Black Sapphire Metallic | Premium Pkg | Sport Pkg | Tow Pkg | Xenon | Sliding Load Floor.