Its doing it really badly ( spiining ball for 10-30 seconds on pressing play).. Also qutting randomly sometimes now with only two Software instruments loaded.. I'm wondering whether it may be a RAM issue.. Ive got the buffer set to 256 so that i can also do some guiatar tracking but With two Pizz instruments, one instance of Stylus RMX loaded and a few audio its shouldn't be taxed at all. I've reset the NVRAM and the SMC..Ive got plenty of space on both my boot drive and my audio drive where all the samples are.. Soo frustrating.. thanks for any extra help there may be out there.. You are all true legends!!! Does anyone know where I might be able to find a legit copy of Logic 10.4.6 so that i can maybe do a reinstall.. No other apps are getting the spinning ball..as far as Im aware.