Mortgage question

My home loan was modified through Naca in Septemembr 2009. I missed the first payment because my mortgage company told me the first payment would be drafted from my checking account in 30 days and I was under the assumtion a payment would not be necesery until that time so I paid my past due property taxes instead.When It was brought to my attention that I was a payment behind I paid half of what I was behind on but never have made up the rest because i did'nt have it.Since thats first payment all payments have been paid on time as they were drafted from my checking account. I paid another $50 towrads what I am behind on last week and Plan to keep paying what i can until it's all paid.The problem is I just recieved a letter from my mortage company saying my account is being handled by their real estate department now.What does that mean and will they foreclose on me for being a half payment behind? I also just resubmitted a new file to naca and they submited it to my mortage company in an attempt to keep my payment modified.Since I am a half payment behind not inlcuding late fees what are my odds of here? I plan to pay the past due amount and not any of the late fees.Can they forclose if I don't pay the late fees?