It's been a while since you asked this question with no replies, so I don't know if your issue has been resolved or not. Here is how I "fixed" the issue.
-Go into your stock messaging app, go into settings.
-Scroll down to the "auto-retrieve" selection, make sure it is checked (as in "on")
That should be it. That's how I stopped getting those annoying "hidden sender" pop ups every time I got a picture message. I hope this helps!
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