Since the latest update, the Web Video Caster app on my phone no longer "sees" my Roku Ultra and can't connect to cast video.
The phone and the Ultra are on the same network, the signal is excellent, I have rebooted the Roku as well as my gateway repeatedly to no avail. It has been working fine for months until the 10.5 update.
We cast a lot and it's especially disappointing because we switched ALL of our tvs from 4k Firesticks to Roku SPECIFICALLY bc Firestick dumped their screen mirroring feature.
DO BETTER ROKU, or at least give us the option to roll back your **bleep** updates
The basics are to restart the Roku, the router, and the Mobile device you have Web Video Caster installed on.
Also, verify that you have Web Video Caster Channel installed on the Roku. (This is the companion Channel/app). Make sure it is updated. Press * on the Channel and Check for Updates.
Under the Cast button/icon within the Web Video Cast app, select the gear icon (settings), verify you still have Roku enabled/checked as "devices to scan for".
You can also try connecting to your Roku's IP address from the Cast Screen as well. To find your Roku IP, from Roku Home Screen, navigate to Settings..System..About [press OK] or from Settings..Network..About. Then look for IP address.
I have had to use the above procedure a couple of times. Then next time Web Video Caster would see the device by itself.
Another setting you can try is located under the main Settings in the Web Video Caster App (hamburger icon). Navigate to Settings..Casting and see if enabling "Show Legacy Roku Target". (this essentially plays media through Roku Play" and will provide another separate coñnection in the list of devices to connect to.
As a reminder, make sure your phone/Mobile device is connected to the same network as the Roku (verify not using phone data but is actually connected to wifi network).
All the above is assuming casting online content to Roku. There are additional settings to configure if trying to cast dlna devices and such and those have to be configured both within the App and at your router.
Latest version of Android Web Video Caster is 5.4.1 rev. 3902 so make sure you are using latest.
Roku Community Streaming Expert Just another Roku user... I am not a Roku employee. Insignia RokuTV, Ultra 4660x, Premiere+ 3921, Express 4k+ 3941
You can also contact the developers over at Web Video Caster. They are quite responsive and may have some more ideas or may be aware/unaware of a fix. Make sure to provide them the details of your Roku model and specifics in your issue.