Then I read forums, check all parameters, but cookies integration didn’t work.
When I have searched for answer – I have tried to change my BB_AUTH_KEY = AUTH_KEY, BB_SECURE_AUTH_KEY=SECURE_AUTH_KEY etc. parameters in wp-config.php and bb-config.php on somthing simple (‘d’) — suddenly, cookie integration begin to work.
I did several experiments and found that if keys too long – cookie integration don’t work. Keys with length 32 chars — still work, but keys with length 64 chars don’t work at all.