Dear Lutz,
I have made the correction. Thanks for pointing out the bug.
It will be included in next release which should come before summer.
Anyway, you can edit the file, make the correction and then
when you will restart nsp and load scicos it should be ok.
you should see something like:
Processing file: /usr/local/src/nsp2-trunk-gtk3/toolboxes/scicos-4.4/macros/blocks/Misc/MBLOCK.sc
indicating that the file is being resaved to binary format.
Best Regards
jpc