Quote fromSince my question wasnt really answered Ill ask it differently. Is it possible for me to import my normal singleplayer world into adventurecraft?
Yep. Copy and paste your SP save from .minecraft\saves to AdventureCraft\maps. S'that easy =P. All you do after that is start a new world, then choose your map from the map list (you may want to rename its folder to something other than World#).
@Coupon: Someone else asked a similar question recently. As I explained to them, this is usually due to the game not having enough RAM to run, or random memory spikes/leaks that make it think that's the case. It usually helps to fix it if you close programs or other games that use a lot of RAM while playing AdventureCraft, such as Skype, iTunes, 3D or other memory-heavy games, and so forth.