Actually, this is caused by a common "gotcha" in AA: although "pagename" is tracked with Custom/Download/Exit Links, AA doesn't actually allow Page and Custom/Download/Exit Links to be reported together!
So the solution is:
Setup an eVar to track the same value as your Page. A simple way to do this is to set the eVar to "D=pagename". AA will then copy the value from Page into your eVar when it processes the hit.
Now in your report, use that eVar instead of the Page dimension.