Not sure how to describe this, but here it goes.
First Enter Test mode.
I have an container (C1) that on hover triggers a state, which shows another container (C2), and when you move the mouse off C1 the opposite state is triggered automatically and C2 disappears. This all works fine most of time time, but quite often the off state doesn't get triggered which leaves you with C2 visible, and from then on the only way to fix it is to exit test mode, go to C2 and toggle the visibility. When this happens no states seems to get triggered when hovering on/off C1 at all.
Hope that makes some sense.