here is the way I do mine. After changing the size, click apply, wait 2 or 3 seconds, then check the box, then click save, This has been working for me
Hmm, I just tried again, following what you suggested (quote above). I get the message from photobucket while something is apparently trying to happen "photo is being replaced" or something to that effect, with a running bar being displayed during that brief time, then the message that "photo has been successfully replaced" but then when I go back and bring up the photo again it is still the same size as before, unchanged, un-resized.