I've noticed a green outlined box around some of my published images when I view them in my Featurepics gallery(only when I'm logged in). The images always have a couple of views, so am I correct in assuming that it's some sort of lightbox feature? Thanks.

The ones with the green border (for me) are the images I have chosen to be on my profile page. Have you chosen images for your profile page?

Yes, these are the images for the profile page.  There is a tick box on each image when you manage your portfolio, so you can change those if you want.  You can have a maximum or 20 (or is it 24?) in your profile page.

Regards,
Adelaide

Yes, it is 24. And if you select more, the last ones won't show. You'll have to un-select some of the former ones.