Isseu with Webmail

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http://forums.cpanel.net – Hello... I've a problema with webmail...When I login, appears me this: If I choose Horde, like usually i do, then come back again to the login form...This just happens in pc's that access a lot of times. If I access Webmail in a pc that usually not access, it's Ok... Help me please... Attached Thumbnails   (HowTos)