I watch a lot of K-dramas with subtitles on Hulu. I'm not a quick reader, so I often pause the show to read the subtitles. But a couple of weeks ago, when I paused the show the subtitles disappeared but returned when I pressed play. So now I can't enjoy or watch the K-dramas anymore on Hulu.
You need to contact Hulu. That's not how subtitles work by default in the Roku "OS", so I suspect they are doing something non-standard with their app.
I noticed the same thing. When I pause Roku while watching a K-Drama on Hulu, there is an overlay over the subtitles showing rewind, play, fast forward symbols totally blocking the subtitles. It seems to be unique to Hulu, so it may be some kind of programming glitch between Roku and Hulu. Will need to search further to see if anyone has found a solution or follow-up with both Roku and Hulu on the issue. I have Hulu with ads which is HORRIBLE. They are too long (2 minutes) and too frequent in comparison to a free streaming tool like TUBI which also has ads (maybe 30 seconds and far less frequent). There are no problems with the pause on TUBI, NETFLIX, KOCAWA and subtitles still being displayed. Hulu is also frustrating because it doesn't rewind as quickly as other streaming apps. So the overall problems seems like it might fall with Hulu.