I played MCA (4.0.4 for 1.7.2) for few in-game days in Normal survival mode. Everything worked properly. Then I went to caves (entry 15 blocks away from house), got gold and wanted to marry woman next day but I could not find her. When I went back to surface from cave, I saved items to chest and went to village (15 blocks away from house) and she was still there. Next day she was not. I thought maybe she gone hunting for few days but she never appeared. Then I saw there are more missing villagers in village like priest, smith and few others. I was very upset because of her. When I saw them mysteriuosly missing, I crafted ring and married one woman. I am afraid that I will not be able to use functions with priest and so on. Please take a look at it if you can. Thank you very much.

Villagers do not despawn, so it's probable that they died from being attacked by mobs or something. Try to protect those that you want to keep around by making them stay or placing guards near them.

You are right. I lighted whole village even interiors because i think enemy mobs were spawning inside houses. I made high-enough barrier and left no shadow in village. Looks like everything is okay. Thank you very much for your response.