Lost Entries in WSUS Console Tree - How do I get back?

Question

OK, I feel stupid asking this, because I'm sure the answer is easy, but I've searched and not found anything on this (maybe too easy to have been asked before, or maybe I just didn't include the right keywords in my search attempts):
This applies to the current version of WSUS in Windows Server 2012 R2.
I right clicked and selected "New Window from Here" on the Options icon in the MMC Console tree on the left of the WSUS window. I had thought this would open a new window so I'd have 2 WSUS windows open so I could look at multiple pages on my screen
at the same time. Unfortunately, that's not what "New Windows from Here" did. Instead, it changed the view in the existing window to Options and removed everything from the Console Tree in the left pane except for Options.
To be clear, nothing is wrong with WSUS -- it's working fine. I just screwed up the management console so I can't see anything except the Options page now, can't get to the reports or the page where I can review Sync status, approve updates, etc. I can now
only access the Options page.
I've closed and restarted the WSUS MMC. I clicked on File | Options... and deleted the profile changes. Nothing has restored the console tree. How do I get this back?
As an aside, while I feel stupid for not being able to restore the Console tree, I also think it's poor UI design that "New Window from Here" changes the existing window with no obvious "back" option, instead of opening a new window,
as the command's name implies will happen. Even for us administrators, when there is a GUI option, at least this kind of simple navigation should be safe and intuitive.
Thanks,
Colin
Colin

Answer 1

Lawrence, thank you for your post and the excellent graphics. The sfc /scannow I mentioned I was running has finished. It did indeed restore the original wsus.msc file, or at least the file date is back to the same value it was before (1/1/15 1:25pm).
I've also tried restarting the server. However, I still get the same error when trying to open WSUS from the Tools menu of the Server Manager or from the Start screen:
Microsoft Management Console
MMC cannot open the file C:\Program Files\Update
Services\AdministratorSnapin\wsus.msc
This may be because the file does not exist, is not an MMC console, or
was created by a later version of MMC. This may also be because you
do not have sufficient access rights to the file.
Any ideas how to fix this? When I search for this error online, I just find issues relating to XP.
Just as an aside on MDI (which may have been exactly what did happen in the first place, as you said, and I just missed it), it is clearly a design component that Microsoft is moving away from. I think that's good. For example Word and Excel used to be MDI,
but now, thankfully, each window has its own full frame/chrome. In almost all cases, that provides a much better UX (hence the change by MS). The real pain is that to put two (or more)windows next to each other, in addition to positioning them, with MDI, you
also have to expand the parent window large enough to see both of them, which means that if they are not exactly a rectangle together, you are covering part of the desktop just for the parent's background. It's also a pain to have scroll bars to move a viewport
to see windows within, as opposed to just dragging the (child) windows themselves. Maybe for a TS/Remote Desktop session, where you have lots of separate programs running and you want to keep them confined to a parent window, this makes sense, but there are
not many other situations where MDI is desirable.
Colin