I'm currently struggling with an Alpha issue of unknown origin. Since I'm having the issue and keymaster does not it would be helpful if some of you (the users) would help to confirm it.
You just need to open the scene (max 2014 or 2015) and press render. A little framebuffer will open with an image that was combined via a maxscript postrender callback showing the error. Please save it as a jpg and upload it here + note the corona version you're using (daily build date or A6)
Thanks everyone.