No worries gijs,
The file will take a minute to load up. also try right click “save as”
here is an image of what happens with your file on my computer. very strange.
This is gijs file, simply opened and hitting the render button
I als get a different result every rendering. So basically with the second rendering, you are just ‘lucky’.
Is the bottom of the bottle coplanar with the floor? does it go away if you increase the Secondary Raytrace Bias?
This appears to be a problem with the V-Ray material; Gijs, you can send me an email and I can get you a fix for this problem.
Best regards,
Vlado
Thanks, I’ve just dropped you a pm