When I go to view my portfolio by best match it shows 97 files
If I view by downloads I see 149 files
My portfolio size is 150, 1 has just been approved so I am not surprised that their would be a time lag for that one file.

This also coincides with a really poor month and big gaps between downloads.

Any one else seeing this / think its likely to be an issue?

http://www.istockphoto.com/user_view.php?id=1257521
If this is you, I see 149 files under every sort option. If you are still having the same problem, you might try clearing your browser cache. It doesn't appear to be a site problem.

I tried a different machine - still 97, it could be a specific server issue rather than sitewide, Thanks for checking. I have raised a support ticket.

I agree with michealo. On his profile page it says he has 150 files, but when you go to his portfolio he only has 97 under best match search.

Well, I guess it's good to put in a support ticket. I'm still seeing 149 under every sort, including best match, but as you say, perhaps we are being served from different servers.

Did you turn off the adult content filter?

I also have a different in my numbers, but it's only five.  I'm guessing (hoping) the missing 5 are just recently accepted images.

My adult filter is ON and I see all 150 under best match. Weird 

I see 150.  At first I thought you might have the people only filter on but you don't really have many pictures of people so that wouldn't account for it even if you did.