This is more out of interest than anything. I have had issues with Shutter not acting on the arrows or the close glyphs. It recognised that they were tapped but did nothing. Sometimes it was ok other times not. It never had problems on the desktop.
I finally tracked it down to whenever I opened the page from an icon on the ipad it failed, otherwise simply typing the URL or selecting a pre-existing bookmark it would work. The issue turned out to be that the ipad icon had, for some unknown reason, a double slash at the end of the URL. This caused the issue. I can emulate it on the desktop. It also produces some interesting side affects depending on the display mode (mosaic etc.) and under different browsers on the desktop as well.
You can try this if interested
Then try again and add two slashes at the end of the URL before reloading. I’d be interested to know if it actually does work ok so I can see if there is anything else in the mix.
As I said, only out of interest.