part disapears when trying to drag component

[remivanysacker]

hey,

I have this problem when I try to drag a component while the component is defined correctly a component dissapears. In this case the black beraings as you can see in the first picture dissepear imediatly when I click drag component and I don't know why , can somebody please help me ? 

thanks a lot !!

[MartinHanak]

Assembly is saved in Educational format.

[ArnaudVandeVeer · Accepted solution]

you had something strange in the imported "estm-16-174.prt" part .... replace your parts with the content from below/attached zip and fix the issues that fail on the top level assembly ... then it all works again