yes there's a fade-up-from-black animation on many transitional screens. Temple can do many weird things depending, I assume, on the server communication going on in the background. Heroes stay in a clump in the middle, or varying degrees of "who turned out the lights?". If the game froze and became unresponsive, that's a different beast. But if you were able to back out and re-enter and everything was fine, that's just a gfx hiccup.