there has been no recent ProgTV updates to reflect the need for authentication (with the free versions anyway)
Unless somehow you got a Pro version as apposed to a Free version ?
Latest Free version for Android: 2.38.0
Maybe try reloading the 2.38 version
Mine is doing the same thing and I'm on the latest free version...
Some channels are working but most of them, like the espn channels are giving an invalid username/password...
I've used the iptv reset but it still is not showing those channels. It just started doing this in the last few days.