Changed it to GS and the same problem. I will try your second suggestion next when I have time a little later. It sounds like you have a copy of GS. Can you try redownloading the current version and try packaging it unmodified? Right now its either a problem for everyone, a select few or just me and its another weird quirk of UE4 where something in this package doesn’t like something on my computer or the way 4.8.3 is installed on my computer.