max 2011 vs max 2012 light cache

Hi,

I have this problem. Load up a scene and make a render. In max 2012 no problem, light cache computed in 15 seconds. In max 2011 after two minutes nothing and show me about 70 hours.
I realise I using different versions in max 2011 and max 2012.

Vlado, I use nightly build in max 2012 with solved viewport problem. In max 2011 I use latest build from web I think. But is this normal?

I install same nightly build to max 2011 and it render the same way like in max 2012, light cache was calculated in 15 seconds. Dont know what makes this problem, but computing is much faster now than with standard vray version downloaded from web site.