>>If I try to go back more than 1 day, so the messages have to be expanded, the tree expansion doesn't work.
>
>Is this a browser issue or you have it like that on all browsers? Can you also give me a simulation path so I can try to simulate it?

An enhancement wish: You have the dropdown list "Time warp", but very often the choices are too few. May I ask you to add for instance 40 minutes, 4 hours, 9 hours, 18 hours and 4 days?

BTW, why do you have numeric minutes and hours (1,2,5..) and character days and weeks (one, two), looks inconsistent to me.