1)Happens on PDA versions. When a user enters wrong information in the log in form using a mobile device, hes redirected to a very weird page that does not exist and therefore un editable. Try it on my website www.primedateinc.com/pda OR your website which i do not know.
Users are redirected to /index/1-0-1 , this is the 'User login page' template.
2)Users who are locally authorized experience auto log off when trying to access a module which guests are not allowed to view. They have to log in again to access the module.
NB: This happens to all my websites, and my friend's websites.
I can't confirm the problem. Please create a test account on your website, provide the login data (you can PM me the data) and the link to the module closed for Guests.
I'm not active on the forum anymore. Please contact other forum staff.