The last few times I've checked for updates, I've had the message appear that the software needs updating, so the user interface window needs to close (or keep the window open and possibly need a reboot after).
This seems to be a fairly new thing - but frequent. Is this correct behavior (or is there a problem)?
It's normal as far as I know. The newest software in beta testing does, I think, not need to close to update, unless it's something major.