If Hi-Fi Cast cannot see your UPnP/DLNA and/or Chromecast devices then I suggest you try the following:
- Check that your devices are switched on and connected to the same local network - but of course you've done that already haven't you!
- If the problem is with a UPnP/DLNA media server, check that the server software is actually running/enabled on the NAS/Router/Computer on which it is installed.
- It could be a network problem. Rebooting your router can sometimes (often) help...so do it!
- You can also try rebooting your phone/tablet, media server, render and/or chromecast(s).
- Apparently some routers have problems with IP multicast networking (required for UPnP device discovery) on the 5GHz band so you could try disabling that on your router (or configure your devices to connect to the 2.4GHz band). This problem has been reported with the following routers:
- Apparently some routers have problems with IP multicast networking when one device is connected via wireless and the other via a wired connection. Try connecting all devices to the wireless network.
- Apparently some dual band routers have problems with IP multicast networking when devices are connected to different bands. Try connecting all devices to the same band.
- Apparently some routers have problems with IP multicast networking when the 'IGMP snooping' setting is enabled so you could try disabling that on your router
For Chromecast Devices:
- Check that the status light on the Chromecast is not flashing. If it is, there may be a network problem or the Chromecast might be installing new firmware.
- Ensure you are connected to the internet. An internet connection is required even when playing files from the local network (this is a Chromecast requirement - there's nothing I can do about it).
- For Chromecast Video devices, turn on your TV and check for error messages.