I would need to see whats in the database however no bidding emails are send out on a buy it now purchase so thats the confusing part here.
The only thing that can send out a winning bidder email is the sendnotice expiration script and if the poster themselves ends there auction
This is the whole buyer id of code
Code:
Content visible to verified customers only.
Make sure yours matches what is posted here
Yes I would need more information about your issue database etc to comment more. This whole process was extensively tested and no users have posted problems since the release of 3.0 and the new ipn verification.