Hello all, I have the same problem with a samsung galaxy ace and FrontlineSMS v2.
I actually think that if the same problem encountered with FrontlineSMS Cloud, the problem is on SMSSync. the same way I do not have logs is empty.
I confirm that sends I have no problem, but I had received a few messages that are put together in frontline, but many did not arrive in FrontlineSMS.
My sync URL is : http://192.168.2.11:8130/api/1/smssync/2/Secret1901
I would be happy to help because I do not see at all how to fix the problem.
Thank you very much.