Please report on the bugtracker -
Most common login problems - caps lock
Mispelled password
Your email server is sending the verification to spam (check your spam folder)
Wrong or misspelled user name
Combination of Google Chrome & Windows8 - For some reason they don't get along - try another browser to see if that works. 
not allowing 3rd party cookies
Not allowing Java Script or redirects
Being blocked by your own antivirus or firewall 
Proxy settings
When you report -please give us some information to work with.
What Version of Windows?
What Browser & version - Have you tried any others? Which ones?
What email service do you use?
Geographical location ( country & region)
ISP - who do you get your internet from?
Any error message? - please copy it and paste it into your report
What Antivirus & firewall are you using?
Are you using any proxy service? Which one?
Have you tried to login on a different computer?