I found a weird (very minor) bug in the Roku app.
Currently using 3.0.111 (which appears to be the same as the beta -- was happening in the previous live app as well).
Using it on a TCL Roku TV and a Roku Streaming Stick.
If I perform the following:
Movies >> All Movies >> (any movie)
Scroll down to chapters and start playing at any chapter
After playback starts, hit back to go back to the movie summary screen
Hit back again to the All Movies list, and the movie you were just in is gone from the list.
Backing out to the Movies screen and back in to All Movies restores it, so I'd call this a mild cosmetic bug. And, the best I can tell, you have to start at a specific chapter for it to vanish. I've started from the beginning and chosen a resume and no vanishing. So, this probably only affects weird people like me who want to open movies at certain spots (what can I say? I've learned where my favorite songs are in musicals)
I can also cause multiple movies to vanish from the list by repeating it with multiple titles. And, if you scroll enough titles to pull another 150 chunk from the server, oddities happen in the area where the overlap should have happened. I think these are just side effects of the root bug.
I didn't try this with TV shows. Mostly because they're a couple levels deeper in navigation.
I'd call it semi-cosmetic and very low priority (because you have to perform weird steps), but wanted to bring it to your attention in the unlikely event it could cause something else to not be happy.