raster: non square windows?

[Ludo Pagie]

Hello,

I'm trying to make a non-square window, but I get a core dump message :
*** event raised for error: WindowUsage
nonsquare zoom given.
*** execution terminating due to error
Abort (core dumped)

this also happens in (standard) heatbugs if I change one of the "world sizes"
from 80 to (e.g.) 40, either in the source code or via the probe.

Am I  overseeing something (again), or ....?

Ludo.
P.S. thanks for the (overwhleming and quick) response to my previous question.