Am I the only one seeing a rather excessive number of portrait not founds?

Yeah, that's happening to me as well, in lots of my games.

In reply to CaesarCV (msg # 1):

It happens from time to time. Probably a server issue. I wouldn't worry too much.

Maybe they're in the middle of an update.

In reply to CaesarCV (msg # 4):

*crosses fingers *

I wonder what it could be about?

You can easily tell if the portrait servers are working (or if it's just you) by clicking the "FAQs" link at the upper right, then clicking "View RPoL Information" on the left-hand side of the pop-up window.

Near the bottom will be the status of the portrait servers.  It looks like Portrait Server 1 is currently offline.  I'm sure the owner/donator will be along as soon as possible to let us know what's up.

And whatever it was, they're both now working again.