Thanks a lot for all.

It is also possible to see Trachel classes involved, so maybe there is a problem with some Roassal code.

Yes, it is. I will write a letter on moose-dev list about it.

did you try to bring up the halo menu and select "debug drawing error��?

Thanks, it works. Now I will know what to do in similar situations.

This error looks like AthensCairoMatrix translateBy is called with wrong argument type.
This may happen if it is called with a fraction instead of a float type.

Yes, that was exactly the problem.

Thanks.

Best regards,

Natalia