DR buckets mismatch (not missing textures)

[cadmonkey33]

Hi,
I'm getting a regular bucket brightness issue when using DR.
This has only started happening since my workstation was upgraded to an i7 980x. The slaves are Q8200's or Q6600's. The i7 renders brighter than all the slaves.

There are no missing textures, and i get the same results whether i precalc the lightcache or not.
I'm used to the typical DR issues, and have checked that all the textures are being found. I've also merged into a new scene.

The i7 is running Windows7 x64, max 2010 SP1, Vray 1.5 sp4a
the slaves are running XP x64, max 2010 SP1, Vray 1.5 sp4a

Any suggestions would be welcome. ive wasted 2 days trying to fix this.

thanks,
Nat.

[cadmonkey33]

after some further investigation, it seems this might be a corrupt scene. the problem is intermittant, and still happens occasionally when the i7 is disconnected.