I couldnt see this commented on in the forum. So just be aware that some files uploaded recently are not searchable, nor do they appear in portfolios.

No information about whether this will be fixed. Thread open in Help forum.

Problem has been on and off, in various manifestations, since early July at least.
http://www.istockphoto.com/forum_messages.php?threadid=361816&page=1

Great...