Sorry, been busy. No, it doesn't really make sense to be honest. It should NOT need re-installing every session. That's just ... odd. I'm sorry, but I'll have to leave this and hope that someone more experienced might have some useful data for you, as I'm not familiar enough with this issue, even when using Gnome (which is 90% of the time), I don't have these issues, so have no idea where to start resolving them. Sorry.