Thought it was worth having a thread about any issues with upgrading to Mavericks that are relevant to photographers and image makers. I have just updated my early 2008 Macbook Pro (my backup mac) and all went smoothly. It free'd up 5GB of disk space and I'm hoping for better battery life. This is the kind of OS update I like with performance/productivity gains rather than whizzy features that don't really do anything. One thing I have noticed in Lightroom 4 the sliders now all have a pale grey background rather than the gradients they had before. Not really a big deal. Anyone had any other issues?