Thought my mac needed reinstalling but it seems i can reproduce this bug. I normally load and save all of my xrns’s to a usb external hard drive. Loading a song and playing it is fine until i focus on another app. Renoise will happily continue playing the song but when i focus back to renoise, the gui freezes for 5 - 10 seconds. The song is still playing in the background without any crackles and the mouse pointer turns in to a spining wheel until the gui starts moving again. I just tested this with 1.9.1 and it seems to be doing the same thing. Also noticed, the bigger the song file, the longer the pause. By the way, all is fine when working with files from the local drive. I guess for now ill just work with the current song from the desktop. Is it a renoise bug or a mac thing? All other apps dont seem to have this problem when using files from the external drive.