I've been using SysConfugurator to tweak setting in SYS.TXT for my Primo 2.0 installation. I did supsect that not all the changes have worked which I put down to a possible difference with the paramaters in 2.0 (and SysConfigurator maybe being for an earlier version of primo as well as Igo 8).
But when I look at the contents of SYS.TXT I notice that some parameters have quotations around the value them i.e. use_all_building_textures="1" whilst ...