Samsung s6 (sm-920G) advanced msg feature no longer works after update

I used to get delivered/read reports on my s6. After the AT&T update last week, this feature no longer works.
When I tried to disable advanced messaging in an effort to kick the feature in the pants I get a "unable to turn off advanced msg" please wait until all file xfer via msg are done...screen

Anyone find a fix for this?

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