I had some issues with old networks(couple of months but were fine just a few days ago) where various nodes just won't work. 

To nama a few : Axis System to Elements / Offset plane / Assemble / Disassemble / Translate Length Dir, perhaps others. Perhaps they have been updated/rewritten? The remedy i found it to create new ones and rewire but it has been tricky as some did not show sign (red) that there is something wrong with them.

Would like to know if it just a local issue with my setup or something more than that as it took time to get to the bottom of it.