Yup, I have this problem too. I have an older Roku and never had any problem streaming the Slingbox to it. I'm now using a new Roku streaming stick that I guess updated itself in January, unbeknownst to me. My iPad Slingplayer app doesn't connect, and doesn't register the option to watch on the Roku. Slingbox said about a month ago Roku did an update and now it no longer works. They said Roku will blame them and say it's their problem but it's not something they can fix because they didn't do the update. Although it's true that Slingbox is super slow to do updates to the apps. They told me to reach out to Roku and let them know because the more people that do the more likely they'll fix it. I get it, each one can blame the other, but it only happened after the Roku update (allegedly). But I see that Roku could say it's up to Slingplayer to keep up and do their own update. Either way it's a MASSIVE PAIN IN THE BUTT! I'm thousands of miles away from home with no English language channels to watch. I have my Roku on a nice big TV and my slingbox working on my iPad. I just want to watch on a big screen. This beyond annoying.
I tried contacting Roku to make them aware, but I don't see any option on the website to contact them since it I have to go select the Roku I'm using and then it tells me there's no support. I know there's no support, I just want to email them to make them aware yet another user is annoyed by this. If anyone knows how to contact them please post it here so we can all get on at both Slingbox and Roku to fix this mess!