Have just completed two major bug fixes for the app. It turned out that when you changed the brightness of the "sun" and linked to your map, your custom brightness setting was discarded and replaced with a default value. I put that update online last night. But today I finally figured out what was causing a very major bug in the color shaders. You may have noticed something similar, flat geometric areas of solid colors. This was pretty rare, but it was repeatable and it had me stumped. The old version is shown on the left below and the updated version on the right.
Turned out to be a stupid error at the beginning of my shader code that caused the highest elevations on the map to have the wrong colors. The exact effect varied depending on the exact mix of elevations in the map and the shader. Most of the time, it wasn't really noticeable but in extreme cases it generated illegal RGB values, causing this kind of error.
But this bug affected the coloring of the whole map in a more subtle way, making the high elevations appear to be even higher than they really were. If you've saved any images or links with the color shaders, have another look at them. They are going to look a bit different now, but they will accurately represent the color scale and gradients of the shader.
This update just went live around noon today. As usual, the browser cache might prevent you from seeing the new version, which can be fixed by clearing your cache.