I suppose what it is a bug, but I can't tell to developers - there is guy on forum for whom it doesn't work! The developer won't take up this issue, if it won't have error logs, and only complaints at forum.
Therefore once again - if you can't gather error logs and debug this problem by yourself - please, contact support team, provide root access and support guys will check it, gather all necessary information and submit bug to developers. If it is really bug but not your faults - you will be refunded for this ticket!