Here are a few issues common to websites like Session Girls, and how to resolve them.
Login / Password Problems
If you find yourself unable to log in, particularly you try to log in but it just doesn't allow it (not that you get a bad password message), this is usually a browser cookie issue. Clear any cookies in your browser relating to SessionGirls.com and this should be fixed. On most browsers, you can delete all cookies or "clear private data". If you don't want to clear everything, this website tells you how to remove specific cookies for various browser.
Profile Editing Problems
Another possible error affects profiles that have been around for a long time. Over the course of the last year, several profile fields were made mandatory (gender and location). If your account was made prior to this, and those were not filled out, you may experience errors when you try to edit your profile but do not complete those fields.