If I use the keyboard entry for the nth root Ctrl[2] Ctrl[5], the Ctrl[2] is ok but at ctrl[5] it opens the CDF web deployment wizard. Choosing the entry from the assistant is fine. Paul.
My issues seem to have been cleared up in 10.0.2.
This seems to be fixed in version 10.0.2, at least I haven't seen it happen since I'm using that version anymore...
In case anyone is interested or is seeing the same problem: I have reported the behavior as described above to the technical support and have received an answer which confirms that the problem is triggered by switching the keyboard layout. The problem has been reported by others, is known to the developers and will hopefully be fixed in a future version. For the moment the solution is to not switch the keyboard layout during Mathematica sessions...
Sorry, Albert. I misinterpreted your statement that "Ctrl-C does open a TemplateNotebook" as something you expected rather than something you thought was wrong. (Had I thought a bit more I should have figured that out. The "Publish" key is the one that causes me the most trouble.)
Mathematica 10.0.1 Windows 7: Works the same as Kevin's (i.e., as expected). Albert: Ctrl-C is usually assigned to "Copy to the clipboard".
I am using mma10.0.1 under windows 8.1. With the default nb style, Ctrl+2,Ctrl+5 gives me the root with two boxes to be filled in, which is what I think you wanted.