I did a quick search and couldn't find anything, I thought I would trail back through my book by Scott Kelby on Lightroom 2. I am currently running Snow Leopard on my MBP, what I did not realise was that Lightroom is set to open in 32 bit mode by default! To change this:
Finder>Applications>Lightroom>Right Click and select "Get Info">Untick Open in 32 bit mode.
Hope this helps a few people out as I sure didn't know about it!


