PVR IPTV Simple Client

Last week, IPTV was working. (W10 PC)  Now I get no channels listed.  Uninstalled Kodi, re-installed and added IPTV Simple client.  No error message and no tv channels listed in TV section.  I entered the m3u URL correctly and the XMLTV URL correctly, clicked on Enable.  I go to the TV /Channels and no channels.
What does the RUN button in PVR add-ons configuration do?  It is grayed out.