I haven't used any version but 4.0, so I don't know if the little things I'm seeing are old, new or what. There seem to be some quirks from time to time. The main thing I've noticed that is annoying is that sometimes when I get in my media will default to the USB media instead of to what I was listening to when I got out of the car last. Is this something I'm doing that's causing this or is it normal to do this? I've even tried a "Save" for my personal settings while listening to XM thinking that would do it, but, alas, it doesn't. Anyone else seen this and fixed it or am I the only one. Would a reboot help?