Oddly, after the 20 min of failure it took for me to do these steps while writing this, I turn on the phone, stare in disappointment, and then it pops up.
I power cycled everything again in hopes of replicating, and I'm not sure if this is an actual fix, or, if the stars aligned just for today, but, it seems likely that if you just open the Slingplayer app and not have it set to auto connect so that it sits at the main screen for you to connect, if it doesn't show the button, turn the screen on the phone off (lock the screen), wait a few seconds, then power it on, unlock the home screen and stare and wait, then try that process again, it might work.
While this video shows success after two consecutive failures, I was able to replicate it with sometimes up to 6+ failures before a chromecast button would show successfully.
This seems to indicate a problem in the software and not the actual network.
Hopefully this workaround will save some folks from domestic disputes when all they want to do is cast the Thanksgiving football games but alas are stymied due to bad software code checks.
Hey thanks for posting. I've had problems with the cast icon not showing up in the app most of the time for the past 4-5 months on my Android devices. Tonight, it won't show up at all. I realized I wasn't using the "free" app but even then I see nowhere in the free app to cast either. I had am old iPad laying around, fired it up, no problems at all. Obviously this is an issue with the janky code for the Android app. I'm using the new Google Pixel but had the same issues on my Galaxy S6. Wondering when casting will be stable for Android. It's getting quite old.
I upgraded my Note 4 to another ROM, and had the issue where it would take far many more tries than the video shows.
The same held true for my note 10.1 2014 with a custom ROM as well.
My newest, and extremely unfortunate that it has to go this far, is to do the following:
1.) Open Google Home, cast screen
2.) Launch Slingplayer
3.) Power off phone (screen off not full power), power on phone and the cast button appears with consistency.
This is beyond ridiculous.
Slingbox devs - PLEASE fix this nonsense
Here's the response I got from their Facebook support: Hi Chris, yes our team is aware of the issue and we are very sorry that it is taking so long to fix but they are working on a more permanent fix for this issue.
That's all I can get. This is the kind of support a $15 app gets. I've emailed the app developer, tried emailing slingbox, Facebook, Twitter, and this is the extent of support I've gotten. I recommend everyone who has this problem try contacting them outside of this forum, as they obviously stopped checking it. Maybe something more public so potential customers can see the kind of support they'll receive from Slingbox.