Newer sysvars are generally backwards compatible, so as long as you have the newest, your version will work like it always did.
what does 'generally' compatible mean? ;)
well ... that hasn't been my experience.
it seems to make a difference ... but it's difficult to tell for sure as
I get so many errors that I can't really do any real troubleshooting
or isolation of any one problem.
but things appears to happen differently with different sysvars.
now that I can actually run a few different versions ...
perhaps I can come up with a simple test sim to check it out.
and one must also remember to designate/force a 'seed' ...
to eliminate that as one of the variables.
I've created a simulation emporium for zipping and saving simulations/settings.
great.