So you may find that just downloading the heightmaps module is enough, but if you're still having memory issues on gigantic galaxies, try turning down the Planet Surface variety.
Wow! Cari, but your not blowing smoke with this statement.
I just did an experiment in DL 1.5.
Gigantic Galaxy
Habitable Planets - Abundant
Number of Planets - Common
Number of Stars - abundant
Loose Clusters
Anolamies - Abundant
Setting the slider first to 100%, then 50%, then 10% - I start a new game and get to the planet screen. Then Control-N and get back to the planet screen, etc x9.
Check out these memory usage figures:
-100%-------50%------10%-
547,444 - 508,636 - 424,112
647,292 - 587,052 - 438,500
693,424 - 596,740 - 414,652
751,536 - 622,356 - 423,564
801,296 - 644,580 - 426,844
839,100 - 655,404 - 425,244
875,860 - 667,216 - 430,468
903,524 - 684,996 - 430,572
925,312 - 694,112 - 434,444
943,840 - 710,808 - 434,032
Clearly, using the Planet Surface Variety slider has a very dramatic effect on memory usage - especially when combined with many Control-N's.
@Smartie0 - try the slider at a lower value and see if you still get a lot of Control-N crashes.
Another thing is the star and nebula density. If they are set high they use a lot of memory as well. I have mine set to 1 nebula and 61 stars, and I very seldom crash. In fact, there is only one way for me to crash GalCiv - it is that predictable.
If it were a real bug in the game more people would be reporting it. If you post your debug.err info just after the crash it might help to find the problem.