After upgrading 1.1 to 1.6 users with old passwords can log on new users can not log on.

After upgrading from 1.1 to 1.6  all of our older registrants can logon but

new registrants can not using their new passwords.

Its as if Django will read the old passwords, but somehow it no longer

encrypts new passwords that are readable. 

I do see a structural difference in the new passwords

The old passwords looked like this

sha1$c9289$7c6d5430101f10bab8fe5f1991fcaaa7630b36b1

the new passwords look like this

pbkdf2_sha256$12000$joygsrjfs4s8$hL3Fo+g3DxWgZkgZEGonVXJzo+EWm7AuYjA39IAlMNo=

It appears to be in order to be backwards compatible somewhere in Django I need to switch

back to the whatever was creating the sha passwords.

Where in the can I do that?

Please advise 

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