[SOLVED]Entity disappears

[VictorZombie]

Hi, I have a problem with my entity, it works fine while testing but if i close minecraft (or back to title screen) and load again the same map the entity looks like disappeared but still in the same place, just don't shows the model i made for it and the texture, and more, it is rideable but if I try to ride it again it doesn't work, just if i place another new one.

 

Any help about this?

[VictorZombie]

Ok, it's solved now. I had to make some changes and added proxys and some stuff.