Question #687294 on Yade changed:
https://answers.launchpad.net/yade/+question/687294

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hi,

first, check if the **body** is there, interaction comes afterwards. E.g. by 
executing
O.step() # after it, the wall is not visible in GUI
print(U_box.state.ori) # full of NaNs, interaction detection does not work 
then..

to solve this, either block rotational degrees of freedom
U_box.state.blockedDOFs = "XYZ"
or set nonzero inertia
U_box.state.inertia = (1,1,1)

cheers
Jan

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