@ Christo:  This happens on a fairly regular basis.  I've talked to RR admins on many occasions, but they're mystified!  It's guaranteed to not work if I try to post an image from a bot link, but usually if I go into the Forum and open the thread it works okay.  Last night ... nothing.  I'm patient.  Usually when I come back it's okay. 

"If your pictures aren't good enough, you're not close enough."  ...  Robert Capa