I found a minor one,

When you are in a battle log, you click on snapshot.
Then you lose all the GUI, the only way to go back is the back button from the browser.

PS : this thread sounds like a bad movie .. The attack of the mouse pointer, Windows reduction to infinity and beyond

Yep.

At first the snapsahots were opened in a new browser tab, so the current situation is a kind of improvement ^^

The problem is that as snapshots are static pages, I can not include a dynamic menu in them.
Maybe I can use an "iframe" or something like that... (I know you're an IT guy, so I can use this kind of strange barbarous word )