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XF 1.4 Error when logging into the Admin panel

My users are saying the website is acting funny, and when I try to login to the admin panel this is what happens after typing my username and password and clicking Log in. Any ideas what is going on?? The letter M comes up below the Name or Email field.

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A few members are saying the can't log in and some can log in but when opening threads they get an error. Never experienced something like this. I am not having any of these problems, but some of my members are.