upgrade from vt530 went wrong

[opto]

I cannot log in. any idea?

went from an old bitnami stack to a new one with mysql 5.6, php 5.5.
Imported old db with mysqlworkbench (utf8).
corebos proposed to change db to innodb, maybe I forgot that.
SQL: 1 primary key (vtigerportal) could not be deleted, all else went fine.

Now: cannot login. I am returned to login page with empty fields.
code from a github fork.

many thanks,

Klaus