Vigilance – sidebar pic not appearing.

I replaced the default sidebar picture at http://www.martialartsflagstaff.com/wp – with no problems. But when I edited the pic and uploaded, it wouldn’t change. The old pic keeps showing up.

Then I tried uploading the revised pic with a new name, and when I changed the setting to reflect the new name, although my <alt> tag works, the pic doesn’t appear. I’ve cleared the cache, cleared my browser cache, tried multiple names, tried deleting all the pix in the sidebar/images folder, and nothing is working. The only thing which shows up is the original pic or a blank area – or if I switch to the default vigilance.png image, that comes up.

I’m stumped.