Disappearing smoothing

[M_SON]

Hi guys, can someone please let me know why all the objects in the scene are loosing their smoothing? I even had an object that I imported, created as a sphere that looked perfectly fine first time, but  when I opened 2nd time the 3dsmax, the sphere had only 20 segments from 200 left.

P.S. The problem wasn't always like this, started to happen one week ago.

Thank you!

[TomG]

Sounds like this might be a 3ds Max smoothing groups issue, or something relating to normals, particularly as you say it was imported. Can you share more details, such as example renders, what file format you are importing, etc. (Also, why import a sphere, rather than just create one in Max? :) )

[maru]

Is this happening in the viewport or in the rendering? (or both?)
Is this really something related to Corona Renderer? For example, does the issue go away if you uninstall Corona?