I have a mid 2011 iMac. I had a new 2tb internal hard drive installed by a certified Apple engineer in July 2015 (which shows absolutely masses of space on the iMac). I also installed 16 gig of ram in July 2015. I have a 1tb external hardrive which shows just under 500 gig space left and a second 500 gig external hard drive (which is almost full). Can anyone tell me why, with all of this capacity, Logic Pro 9 has recently started crashing after displaying a warning pop up saying the "memory is almost full"? Thanks: Chris.