yes. for example, here is mine, which gives the italicized et al. I also include the view of the settings.
Other things to check, that the authors are correctly entered in the record, one to a line.
Oldham, G. R.
Cummings, A.
Mischel, L. J.
Schmidtke, J. M
Zho, J.
But Endnote 8 is a pretty old version and was buggy to boot, so I would upgrade if it is with-in your power!
(This is a version ENX3 style, but I think they are still compatible).
APA 6th.ens (57.3 KB)