Steps to replicate:
- Open gallery dialog
- When you are on the "Images" tab, scroll down to the bottom.
- Now switch to "Options" tab, try to scroll.
The screen is stuck at a specific scrolling position and it's impossible to scroll back up. It's a bit tricky to replicate, so keep switching tabs and scrolling for couple of times to succeed :)
Also, at some point, it was taking two taps to switch tabs.
Browser: iOS Safari
Device: iPhone 5s