I never use butter when I melt choccy and I do it in either the microwave or the stove. I made rocky road last Friday, no troubles!

Glass bowl and wooden spoon always work fine for me too! As long as the water isn't touching the bowl, it should have been fine. If you think it's getting too hot, take it off for a while, stirring, then you can put it on again if you need to.

Did you leave it on too long and it reduced down iykwim?