I've just started playing KPS on a new (to me) iMac The iMac is running 10.9.5 (Mavericks) and has 16Gb RAM, 2.9Ghz i5. I'm running the latest version of KSP As my KSP session progresses, if I spend too long on Kerbin (airplane stuff rather than orbital), the ground textures begin to go. To try and explain, there appears to be a corrupted texture leaking over the top of the correct texture, like a grey mash-up grid. Soon after this any change in area status; moving between SPH and runway, VAB and pad, causes the game to go black screen and hang. If I go orbital, there isn't quite the same problem but going back to the Space Centre or sometimes even switching ships causes black screen and a hang. It has all the hallmarks of a memory leak. I tend to just use KSP in short bursts now or quicksave a lot. I can cope with this, irritating as it is, but as we lurch towards a 1.0 release I think t needs to be sorted. First, I need to know if any other Mac users or having any similar problems then I can report this as a bug. Thanks for your time.