I'm using a Transformer Prime with Android 4.0.3, though I'm not sure if this bug is platform-specific.
I summoned a Hellhound during combat, finished the fight pretty quickly, then went up a flight of stairs. I don't think the Hellhound followed my party, though. Shortly after getting to the new floor, another fight began. When the summoned Hellhound's turn came up, I got stuck not being able to do anything. Touching any square gives me a message that the space can't be reached, and since the Hellhound isn't anywhere visible, I can't touch the space it's on to end it's turn.