Afaik indigo makes a copy of the image in the newer versions before rewriting it, so there should be no problems there.

The problem you have looks somehow like the ones of realtime terrain renderers (like crysis too). There the triangle density depends on the distance to the camera and the jagginess of the terrain. Would be cool if you could build in such dependencies. Also it would be cool if the subdivision algo co...

Chuck Norris' renders get finished :p

It would be nice to have a compression like png. For example you could just save the difference of a pixel to the pixel left of it. Then you compress everything with zip. Especially the exponents of the colors (they are float, aren't they?) shouldn't change that much over the picture.

its polys*4^number of iterations

What do you want to blend it with?
If you want it to mirror, make a thin (but 3D!) transparent plane in front of it. If you want alpha, thats not possible currently.

You could work with feet first and then scale everything down by some amount. For example you model it with 1 Blender unit = 1 feet. Then scale down by 0.3 and you have 1 Blender unit = 1 meter.

The Terracotta Army is about to get recycled.

It looks as if the reflection is the bottom of the glass, which is jagged in the same way. I guess the IOR may be to high, or maybe your normals are inverted.

For the background you can take this: <background> <spectrum> <rgb> <rgb>1 1 1</rgb> <gamma>2.2</gamma> </rgb> </spectrum> </background> put it under <scene> (doesn't matter if before or after <renderer_settings> or <tonemapping> blocks) For the shadows: I believe shadows aren't explicitly programme...

In the top right corner you can see Ve (Vertice) and Fa (Faces).

Looks like a normal error. Check if the normals are pointing inwards. If so, recalc with CTRL N.
Your curve probably has a twist where it changes from white to black.

Sorry, Indigo doesn't use point lights. You can use an HDRI Image as background for lightning, a sunlight or meshlights. If you want something similar to an arealight, make a plane and give it an emitter material. Then select the type of lightning in the enviroment category of the exporter to what y...

To scale the texture up scale down the uvmap in the uvedit window. Afaik textures should always look the same in Blender as in indigo.
The light could be coming through a thing gap in the wall. Look if there is a gap where the two walls meet in the corner. If so, close it.

You should first make seams at some positions. What you have to get rid of are loops, because thats where the unwrapper bugs most. For example you take a ring. If you just unwrap it, it will make problems. If you make a seam in the ring, it will unwrap to a simple straight line. Do them in positions...