Facing same issue of not receiving new messages.Only attachemts and messages from old wa/whatsup/yappari users.
From logs it looks like problem to parse encrypted messages:
From whatsup/yappari version:

NEW MESSAGE RECEIVED FROM: xxxxxxxxx@s.whatsapp.net : 0 : Hi

from latest whatsapp versions:

INCOMING:
<message from="BBBBBBBB@s.whatsapp.net" id="mg8pXSFUPAPNA" notify="AXXXXXX" t="1441185242" type="text">
<enc type="pkmsg" v="1">
3���!�����E�E*4uzJ��,ï¿ ½k"Ä»W��H�$*>h!(�
��N?�;�s�
��L!9OEs�u�ɺ��q"B3
!Nʣ��O��z�HFvw�RQ��K��2?/�E��">