Google Nexus 5- Hangouts "couldn't download MMS.  Touch to download again."

    I purchased my Nexus 5 in April from T-mobile and I've gotten used to using Hangouts as my SMS/Chat app.  However, recently (once when my signal was not good) and today (when my signal was fine), I missed several texts from my friends who are iphone users.  I received the same error message every time "Couldn't download MMS."  I tried to "touch to download" the message but it did nothing.  I've tried disabling "imessages" on my ipod touch.  I've changed the APN name on my phone from MetroPCS to TMobile GPRS.  I've tried clearing the cache in the hangouts app but I am still missing some texts and I can't understand why.

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