"cracking" paint/joint compound

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I just had my bathroom repainted. Prior to re-painting, my husband and I spent an awful lot of time and effort removing 80+ years worth of paint from the plaster. We had a pretty un-even surface at that point (with some cracks in the plaster), so we called in a professional to prepare the walls.

Its been a month and the paint (or, more likely, joint compound) is cracking---I'm guessing that the temperature changes in the room (its a bathroom, remember) are causing this.

Is there any way to a) repair this and b) prevent it from happening?

My bathroom has no fan, but it does have a window, which we open religiously while showering...

Any ideas?

Thanks!