problem with login
As I said somewhere this is not a problem that can be fixed by any converter: the password saved into the database is encrypted both on IPB side(I hope at least) and SMF side, most likely with two different methods.
Convert the password would mean: decrypt the IPB user's password and re-encrypt it in SMF.
The problem is: it's not possible to decrypt the password (well, it could be possible but it would take years for each password, I don't think you want to have a conversion that last 1 year for each of your members).
So this is not something that can be fixed.
Although if you know how IPB does the encryption you can copy the password too during the conversion and then write a sort of internal bridge that uses the IPB password and encryption method to log into SMF.
(I'm not going to code something similar, so if anyone wants to do it feel free).
and posts will get fixed? :/
What's the problem with posts?