Sure, would have said so with first message but I assumed it was something I was doing.
1. 3DS MAX 2015/Win 7 64.
2. Corona version: 1.2.1, Maxsdk version: 2015
3. This shows up loading files in the material editor, in viewports, and rendering. I have not tried saving output as TGA.
4. See below, it's only the CoronaBitmap map type - default 3DS Bitmap maps do not show this behavior. Same source for both.
5. Material in question is about as simple as a Corona material gets, nothing but level and glossiness changed and diffuse map added.
Let me know if there's any more information that would be helpful.
(Sorry for large images, need to be able to read the text)