I'm useing a new PC (64 bit Vista, quad core, 6gb RAM) I had this issue once before - I think it was in a beta. I'm running 4.6.1. - I've been using this system for over a month without issue.
I was trying to upload about 10 galleries to Zenfolio 3-500 each. (This machine does not have the slow upload issues I had with my older PC on Zenfolio & SmugMug. ) So rarely would the que still have image waiting when I started the next upload. but not always. one gallery had the last 120 of 520 upload the black small file withjust the error text. the next gallery started with some then worked properly for a few then back to the error files. and it was intermitent for the next 4 uploads till I noticed it.
Now I deleted the uploaded galleries and am trying to reupload them but they are ALL failing. I will try to restart PM. and try again.
Is it possible to have this render error NOT upload so that we would know about it???