I have DC installed on several phones and one tablet. Today I received a message consisting of a single attached file ca 5 Mb in size from a user who is /not/ using DC. One of my phones correctly picked up the message with file but three other units did not, not even after extended time. Further, the message remained in the Inbox folder of my e-mail account rather than automatically being moved to the DC folder like for other messages.
Is this perhaps a known problem with large messages?