As of a couple days ago every time I attempt to create new USB boot media, it turns out not to actually be bootable. When attempting to do so, the client machine to which I'm trying to deploy an OS just boots into it's OS after I selected my my new USB as my boot option. I've tried using different USB sticks, tried different model machines as well as creating a new boot image. My old usb sticks still work fine. No changes have been made to my sccm environment in the last few days. Any ideas? Thanks in advance