Not the most pressing problem, but I thought I'd point it out just in case you're unaware. When I cast ice storm the champions, fonts and ground effects keep disappearing and reappearing while the animation is going on.
Off the top of my head, no, but I had the issue with multiple global effect ST spells, anything that made Ice on a massive scale caused it, I only played last night, but it seemed fairly common.
Firestorm, drought, sandspout and Thaw, other terrain modifiers too. I haven't teste it yet but maybe the sand generator and the others terraformers do this too.