So I ran into some bug trying to play a game without the real stars setting.
Whenever I create a system in SM mode, it's always 61 Cygni, always the same two stars, although planets and asteroids vary. When I create a nebula, I get a bunch of errors, and get it again when I access the nebula. The protostar has 61 Cygni A's mass and spectral class, and in system information window, 61 Cygni B isn't listed as part of the nebula, but it does appear on the system map, while its planets appear fine in system information. Can't seem to avoid it, it does it without fail on all games I create.
This is the error I get first, several times on the nebulae stuff :
Error in cboSystems
Error 381 was generated by MSFlexGrid
Subscript out of range
And this one once after the other :
Error in cboSystems
Error 30009 was generated by MSFlexGrid
Invalid Row Value
I can create systems other than 61 Cygni when I use real stars, but obviously can't create nebulae there.
Also, if I set it so Sol is created at game generation, instead of 61 Cygni, I get a bunch of Proxima Centauri. No errors on the nebulae though.