From the hotfixes performed on 07.06.11:
◦Lord Rhyolith can now be quickly snapped from left to right, or right to left, if the appropriate amount of damage is dealt to the opposite foot.
◦Lord Rhyolith now prefers to activate volcanoes that are in front of him over volcanoes that are behind him.
◦Lord Rhyolith now spawns slightly further back on his platform, allowing players to stand on the edge of the terrain and not aggro him.
◦Lord Rhyolith no longer despawns when reaching the end of the encounter area, and does not despawn when casting Drink Magma from any of the possible locations.
◦Lord Rhyolith now summons in volcanoes when intended, and it is no longer possible for the first set of volcanoes to be ignored.
Please refer to the full list of hotfixes here:http://wow.joystiq.com/2011/07/07/patch ... #continued