I had the same problem with my Edge not working on a jailbroken 2.2 despite talking to apple and AT&T. I am pretty new to the iphone and this edge ***** had been driving me crazy all day... I was just about to reset everything and start over when I saw this page. I had never used Bossprefs, and it totally did the trick for me (not to mention it is kinda a cool little app in other ways... easy way to get the numeric battery and manage icons and such).
Anyway, I just wanted to let you know your advice worked for me and your help was VERY appreciated

Also, if others have this problem Bossprefs might be worth a try.