I attempted to change my password, and was then unable to login, even though I literally copied and pasted into the fields to set the password and to log in, so it could not have been entered incorrectly. I tried again by hand, in case the game for some reason won't accept pasted text. It did change my password away from the old one, to something. So I had to reset the password.
I assume this means there are some constraints on the password then.
Is there a maximum password length? If so, it's 15, isn't it. I was over that length.
Are there limits on which characters can and cannot be used? If so, I violated that also, I assume.
There isn't anything on the password changing screen that mentions any constraints, so I did not know what to expect and what not to.
If there aren't any constraints, then I guess my computer is just acting bizarre, which isn't unusual...