Can't see glass as it turns

[Furnace]

Hi,
I have simple scene, it has some 'vertical blinds' with a glass material, which turn to reveal an un-distorted image, when they start to turn the glass objects disappear. I've played with the materials and lighting but its not really improving. The render is just the front viewport window.

I've uploaded the max file.

Appreciate any help.

[Vizioen]

You've animated your visibility from 1 to 0. I don't think that's what you wanted. Updated Max file in attachment. Mind you I've changed your glass a bit too.