I'm living in an apartment. So far I've put up 2 sets of curtains and had the same troubles with both attempts.
One set was over a sliding mirrored closet door (tacky!) and the other set was over a window. What's happening is there's something behind the drywall that's very solid and I can't seem to get my drill into it. In the last apartment, self-drilling anchors like a metal version of these did the trick but in this apartment they couldn't penetrate either. My first thought was some kind of stud, but I ought to be able to drill into wood, right? My next thought was perhaps the doors/windows had some frame that jutted into the wall for support, but the last set of curtains was 4" above the windows. I've never seen a window that had 4" of metal surrounding it.
What the devil could it be? Is this something common? How would you approach this?