From what I remember, the pickup polarizations need to alternate, e.g. Neck = North, Middle = South, Bridge = North (or vice versa).
If you do a search on this site (maybe try "north") or lookup the guitarnuts site, you might find out some more info.
Again, I'm not sure if what I just said is the reason for your problems, but it doesn't hurt to do some research on it.
... and that's all I have to say about that.
[U]ALL[/U] generalizations are [U]WRONG[/U]
[/sarcasm]
[U]ALL[/U] generalizations are [U]WRONG[/U]
[/sarcasm]