There's still an issue/bug on @loops by @dansup that when you go to Notifications -> Someone's Profile and then click the back button at the top of the screen, it takes you all the way back to the first video in your feed, instead of taking you back to where you just came from, which should be your notification screen.
It's not a major bug, but it's certainly an annoying one when you're trying to go through your notifications and check other peoples profiles for various reasons.