lone looker

The error message doesn't stay on the screen long enough for me to read it; it just pops back to the desktop. I have no idea what avatar is. Thanks for trying

I am a novice digital photographer and a novice computer user. Every time I try to upload a photo with my log I get a brief error page, then I get shut out of the geocaching web site, back to my desktop. I know the photo files are the right size; what's going on??