I posted about a similar, if not the same problem, earlier this week but have not received any response yet. However, this evening I was able to fix it, I believe - at least my iPod is now recognized as an iPod and it is currently syncing to my MC 11.0.205 playlist.
Here's what I did after starting with a freshly restored iPod by iTunes:
1) Installed MC 10.0.173 because I had uninstalled it sometime ago. MC 10 was able to see it as an iPod. I initialized my iPod on MC 10, but the playlist I wanted to sync with was an MC 11 playlist.
2) I attempted to restore my MC 11 Library which caused an error message about a version conflict. MC 10 would then no longer open.
3) I had to delete all of the library files in the MC 10 program folder, uninstall and reinstall MC 10 at which point I was able to open MC 10 and restore an MC 10 library. MC 10 always recognized my iPod as an iPod. (I can't remember whether I had to reinitialize my iPod at this point, but I don't think I did.)
4) I opened MC 11 but it still did not see my iPod, just a hard drive as before.
5) Uninstalled MC 11.0.205.
6) Downloaded and installed MC 11.0.211. Then it could see my iPod as an iPod. As mentioned above, my iPod is currently syncing with my large playlist and transferring about 34 GB.
I did not mess with user rights as I am an admin. I don't know whether steps 2 and 3 were just diversions that cost me a little time or if they were part of the solution to my problem. I'd like to think they had nothing to do with it.