Hello Just last night ran into a number of problems Ive never encountered before with my early 2011 MBP and El Capitan. you can read about it here! http://forums.macrumors.com/threads...el-capitan-showing-very-slow-boot-up.1957531/ Anyway, I dont know yet if I should reformat my HD and reinstall El Capitan, but most likely it will come down to that. I did this Clean install of El Capitan less than a week ago. The only important program I have on my drive is Logic Pro X I purchased from the App store about 2 days ago. My question is if I were to reformat and reinstall El Capitan can I reinstall Logic Pro X back on my computer? I have the receipt in my email. Just wondering if theres anything I should know with reinstalling apps purchased from the Apple store. thanks!