I am using Roundcube v0.1-beta2.
It is unable to see attachment, when the message is sent from Microsoft Outlook 2003 and has blank body and has exactly one attachement.
When it has more than one attachment or body contains at least one letter, everything works OK.
It was first mail I try to read from roundcube and I thought i cant read any mail witch attachment from MS Outlook ...
See thread: http://roundcubeforum.net/forum/index.php?topic=424.msg3964#msg3964