Earlier this evening, I was trying to upload a photo to Active Rain. I made myself nuts! I carefully followed the directions I found in some other postings, and it didn't work. In a fit of desperation, I posted a cry for help, and here's the thing!
I got a reply suggesting that it might be my browser. I was using Safari. I opened up AR in Firefox, followed the directions, and it worked like a charm.
So, a big thank you to HomeIndustry.com.