Created by: vicdoval
https://github.com/nortikin/sverchok/issues/3128#issuecomment-622388011 The flag sv_first_run had to be turned to False after reloading.
Also i notice something very strange, sometimes, very few times, when asking for node_tree.nodes after reloading it was returning a random panel data!! (or any other kind) really alien stuff but it happens so weirdly that it could not called or reported as a bug, I did as suggested here https://github.com/nortikin/sverchok/issues/3128#issuecomment-622402343 making a extra check for those cases so it does not report an error in stead reports the rejected data