What causes paint to bubble when painting latex paint on newly primed walls?

I've seen latex paint bubble and peel off the wooden molding because the walls were absorbent sheet rock and the molding had obviously been formerly painted with oil-based enamel.What causes paint to bubble when painting latex paint on newly primed walls?
It sounds like you used oil-based primer. Latex will not stick to a surface where oil-based was used ahead of it. Well, it will stick, but not well.What causes paint to bubble when painting latex paint on newly primed walls?
the paint is not mixed correctly. talk to home depot next time you are there.
The primer did not dry completely - or perhaps the air was humid when you put on the paint.