Ayo, i dont know if its serum or FL studio itself that is causing this problem. but when i render i dont get any sound from my serum patches but the other VSTs and drums are working. And after rendering the Serum instances stop working aswell they dont have any sounds, when i reopen the project the file is working again but the rendering goes the same aswell. i have 1.086 build in serum. Holla at me if you know what may cause this problem. Keep on producing! peace. :)