Since the introduction of the exponent/roughness switch I can't get texture maps to work as intended. First, the exporter from the C4D is obsolete, preview meshes/system will not give the same results, and gamma value is 1.0, while in Indigo's standalone is 2.2. And there seems to be a problem, I don't know where exactly, but just try exporting a simple scene, for example a sphere with Phong material and a texture map in exponent channel. Set the value to, for example 1, leave the gamma at 1 too. Sun system, position is not important. Once in Indigo, go into roughness channel, select any of the value and just hit enter. Boom! Shiny, whereas the previous state was completely flat. You don't even have to change any value, just "refresh" the channel info by ticking on the box, and you'll get the same results. This gives a really awkward, unstreamed feeling between these two apps, and I urge you too update exporters asap, since a lot of things happened, including new material types. It's hardly even usable atm.
I imagine this "refreshing" problem has the same root as the Z.'s problem above. Once you check/uncheck the box, it refreshes the information from the input fields from the Indigo itself (=new value/state). The exported scene itself, without any change in the information retains the exported/converted data.