Hi Luis,
My first thought is that the 3G modem returns an unexpected result for flash messages when Diafaan SMS Server requests a list of newly received messages.
I would like to see the communication log of the modem (just send it to dms@diafaan.com) with the received flash message. See http://www.diafaan.com/how-to/…..-problems/ on how to generate a communication log for the modem.
Which brand and model of 3G modem do you use?
Regards, Henk