No video at top menu after installing Overflow

Well, sorry, but I don't have a fix... I had the same thing happen, but I didn't install Overflow. I think I just ran NitoTV and ATVFiles. At that point I still had Finder, but once I restarted Finder I lost main menu (Finder) like you did.

I'm running a full restore (had to go with Menu & minus for 6 seconds) and will start from the top after OS update is done.

I'll go for restarting Finder after each and every operation I do to see if I can nail down the culprit (seems the only thing we both did was NitoTV).

Good idea about setting up iPhone Remote app. I'll do that first thing before running any mods.

Another note (probably not related) was that I attempted to install Perian and Rowmote through Software Menu, and when the "downloading" screen came up it went immediately back to the previous menu.

I see right away in Software Menu that it says "Update Me" for itself, but when I tried running the updater further down the list I got a similar error and it forced a Finder restart. I'm wondering if Software Menu that gets installed with ATVUSB-Creator (b13) needs some updating.

[Update 1]
Well, at the ATVUSB-Creator site (http://code.google.com/p/atvusb-creator/updates/list) I found a comment in a cry for help thread that talks about ATVFiles being the culprit. So, I guess I'll leave that alone for a while. My guess is that when you installed one of the others (Sapphire / XBMC / NitoTV) your trouble started.

Since Software Menu doesn't want to install Perian, I'm going to take a shot at NitoTV and see if it will run OK. If so then I'll have NitoTV install Perian (I think it does that, as well).

You didn't say if you ever restarted the Finder and/or actually used the first apps, or just installed inside Software Menu and moved on until the error forced a Finder restart. It could be that one of the others is causing the trouble (I'm guessing the problem apps are not compatible with the new Finder layout), but you said you only removed Overflow. Perhaps, since you have SSH access OK you should remove the others one at a time and see if one of them is the actual culprit.

Well, I just ended up installing NitoTV and used it to install everything else I needed. Since a couple other computers and this ATV will be using my video files, I'll just go with iTunes and run the shared library. Too many near full drives connected with video files scattered all over to have other computer users track them all down, as well as the ATV having to mount all kinds of drives just to access them all with ATVFiles or Nito's Files.