Why your own account doesn’t open pages is not something I can advise on. My best guess would be that something is stopping the AJAX processing from working but why you and not the account you set up for us I really could not say. Only you know what other plugins and options you have installed on your website. But you can see for yourself that it is working as expected on a newly created account. There is absolutely nothing in the forum setup or admin options that would cause this behaviour.
And the same really goes for your email problem. This is NOT an SP issue. I have done my best to make a suggestion (have you actually tried it as if you have you have not told us the result?) and to explain that whatever is causing the redirect url to get corrupted is caused by something else you have installed.
As I have already explained – registration, login, logout and user creation etc., is nothing to do with Simple:Press. SP is just a plugin for WordPress which is in control of all of that. Our redirect is just a courtesy to help people. As suggested – and here it is again – I would remove the redirect and see what happens. Perhaps even go further and go to the forum admin > options > email setting sand turn OFF the use of the SP new user email replacement. That way you will be using core WordPress only and whatever is effecting things now might, perhaps, behave itself.