Helped me, too. A tip o' the compass to you! I was mystified as to why a simple "clip" would not work, especially since my feature classes were entirely accessible and not grouped. Couldn't figure out what on Geo was going on (of course this is ESRI, and their "help" was anything but...). Then I read Brendan's post: found and un-selected the "background processing" box, which I had never ticked (but which was ticking me off), and suddenly the clip worked.
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