I have same problem. When i login using cpanel by entering password. It says o choose Roundcue or Horde. When i choose one of them it says Login Failed. Please Some one help me.
You might try clearing your browser cache to see if that helps. Or try another browser.
I cleared the cache and still with problem...
I tried in all browsers in my pc, and after 2 or 3 access happened the same...
Are you using a default x3 theme or some other theme? If you aren't using the default x3, select the default x3 in Change Style area.
Also, are you a cPanel account holder only or have root access on the machine?