It seems to work fine for me, tested in Firefox.
Maybe it is just the usual cache problem with Chrome?

I use Firefox, too. I've already cleaned the cache, but it's not working again today.

For resizing, is the option "Automatic resize/recompress picture if needed" still checked?

Yes, everything is correct. The resized/replaced picture appears only when closing and opening again the broswer. Strange, it never happened before.

Indeed, I had the same issue right now.
I guess that they changed things in the latest version. It seems there is a trend of Firefox of copying some bad ideas from Chrome.
Ctrl+R did not refresh correctly, had to do Ctrl+Shift+R to force refresh discarding cache.

It works with Ctrl+Shift+R only indeed. Thanks!

Is it me or is the site super slow right now?

http://www.imcdb.org/vehicle_1761165-H/illman-1958.html

Picture does not appear and no matter what you click on from that page , it leads you to a Peugeot 404 that most of the time had a rough day..

Fixed the name (but using that link it will keep showing the problem, not very important)