I have this same problem intermittently. Sometimes I can exit the program and come back and it works fine, and other times (like right now), nothing seems to help. Sometimes it will give me the login screen, asking for my username and password, but the password field will be blank (despite having it set to auto-login)... but when I type my password, the login button won't appear properly. As in, it's greyed out. Again, if I quit the application and open it again, sometimes that will fix it and sometimes it won't.
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