1.- Already reported. This version of Yappari implements a newer version of the WhatsApp protocol (1.2) so a lot of things that worked before doesn't work anymore and have to be rewritten.

2.- I don't know why it doesn't work, but it doesn't work. I need time to find out what's different. WhatsApp servers send the image corrupted and I don't know why, and I have to write a program (let's say a WhatsApp protocol analyzer) to see what official clients do different to receive the image properly (maybe something during sendClientConfig()).