Does it do it for all programs, or merely some? It seems to be what happens when the app can't reach the advertising server that's at a different internet address than the main PBS streams. So when it can't reach that server -- which can be at any of a number of addresses and can fail to be reached either because of local firewall settings on your own systems or routing blockage in between you and there -- it just bombs out. Of course, PBS could write its app so when it fails just the advertising fails, and we still get the programs we've paid to subscribe for. But PBS values its advertisers over its public in this.
Anyway, the question is because some shows seem to end up with different advertising servers than others, so sometimes some work while others don't.
