Teamviewer Free always logs me out and then I can't login until I reboot

AKB

This happens on two totally different machines (Windows). After a day or two I am logged out of Team Viewer, however when I go and enter my credentials and click "Sign In" nothing happens at all. Nomatter how many times I try or wait, still nothing. I can restart the application and still the same thing (Even if killed in Task Manager). The only way to log in is to reboot.

What gives?