-Sphin: Strange, it works here also with quotes. I'll look into it - until then, use a path name without quotes.

-GPEngine: No, Z7 does not open always the same trades, it has slightly different behaviour as described under "Z systems". And indeed, you need to define a "neural" function when using the R bridge, or alternatively remove the "neural" function from r.h. This was indeed a leftover from tests. I've uploaded a new version where this is removed.