If a color calibrated screen is used (wide gamut monitors especially), problems can be caused and photos are displayed in a wrong way.
They appear with wrong colors, mostly oversaturated.


This happens if you use a software not supporting color-management (Flash here) inside a color-calibrated system environment.
The solution to see the photos correctly is to display them inside the browser, if the browser supports color-management. Firefox does, Opera and the Internet Explorer not. There you have to save the file locally and open it in a special software, e.g. Photoshop.

More to read about color management at Wikipedia