Exr not saving elements through backburner

[Koper]

Some computer do and others don't, we've got about 25 in the network and only halve will save the render elements with the exr, be it within the exr itself or as a separate element.

 

but rendering as tga then there is no problems

 

Any thoughts??

 

 

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edit - working in max 2010 with the extension