Ok, I will try to return to the previous version of the string tomorrow. Or maybe, there is no need to do that if I already solved the problem with my login? Wait until a forum user reports the problem with their login?
Is there any big benefit in using the new SHA256 hash algorithm? And is it bad that I did not set a personal machine key for our forum when I initially established it? As I understand, now I need to live with the current security settings as they are "till the very end" and never change them in the future.
Only when you switch to a different server it's a problem not to set a machine key