The software does not screw up your password. Many people do not have the correct settings in their browser. This board uses cookies to remember sessions so that next time you come here your Username and password is remembered in your browser. If you use your computer only at home then there is no need to log-off as is only a cookie setting exercise. If you use a publically accessible computer such as at an internet cafe then you must log off otherwise the next person to use tht browser and log onto this board will be logged on as you!
Many people do not bother to change their initial, computer generated password to something easier to rememeber. What happens next is they either change their browser software or change ISP and email address with no access to their previous email address and suddenly they find that they cannot get in because they can't remember their password and have no access to their previous email where the password will be sent if they have not changed it in their profile.
99.99999999% of the time when someone experiences a problem with their password it is because they are not entering it correctly. You password AND your Username are BOTH case sensitive and also if you add any leading or trailing spaces that will not work either. This tends so happen when people copy and paste from their email with the password details, they inadvertantly pick up the space by misuse of the cursor with their mouse.