also if you set
compatibilty = 13;
?
some time ago I got strange high nexus values , but since I set it I had no problem... maybe unrelated, it could have been caused by nexus overflow resulted by setting -nx or max_nexus by a starting level to 200... don't remember exactly.

anyway, a little nexus article would be great about how to use it and how to not to use, and as a possibility to use dynamic memory allocation instead. my editor can eat a lot of nexus, so maybe I would need a better memory management system...