I am alittle confused about your problem. When you say boards are you refering to drywall?
I am going to throw out a general answer until I hear more.
The paint chipping seems to be one of prep, lack of cleaning, putting oil paint on latex, or just bad paint.
If the surface that was painted was a bit wet, then there is your problem. If the area, acquires condensation, there is your problem, If you have had leaking in the past, then i would say that not replacing or not allowing the surface to dry is, I repeat IS your problem here.
Remember, in a real world, you cannot apply oil to latex, but latex to oil will work. Remember in areas that you are unsure of, be sure to prime and sand and prep.