Images & Proxys

I dont know why this is happening or what to do but if anyone can key me in I would apprecaite it.

When I access my website it loads up fine. But if I upload a new image to replace an existing one and then click refresh the old image appears. At first I thought it was my browsers cahce but I completly emptied the chache while the browser was closed and I even used a diffrent browser (Mozilla) but same problem.

When I access one of my other website and do the same thing it works fine. Is this a problem with Dreamhost/My server or could a being behind a proxy have something to do with this?

Proxy might be the problem. I have had that problem once or twice, but not for a very long time.

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