I have a ceramic cooktop and wouldn't exactly say "no problem." Make sure you have a nucleation point for the boiling to occur, such as a stir bar or some sort of stir rod touching the bottom.
Without a nucleation site, superheated liquid can build up at the bottom, setting up a rather unstable situation. A slight bump can cause all of the superheated liquid to vaporize in an instant, causing a hot-wort volcano.
How do I know this? Well, you may be able to guess.