I'm just going to jump in here with one simple noobie suggestion for when fMMS fails to download the picture (I've not long had my phone and never had one I can play around with before ... plus I'm a complete tool when it comes to understanding all your jargon!)

I came here because of said issue, suddenly fMMS stopped working ... then it hit me after trying several things (and thinking "please got don't make me have to learn how to post logs and stuff, it took days to learn how to install fMMS!") that I wasn't connected via contract WAP, I was connected to my work's wireless somehow (despite being back home, weird!).

I changed it back to contract WAP and it works fine again now.

I'm sure this won't work for everyone, just throwing a bone to the people who are a new to this as I am lol