White render passes

When I use backburner, one of my render nodes save all my renderpasses as white. Only beauty pass saves as it should. Any clue?

-which version of Corona?
-same version on all PCs?
-are you using BB only or BB+DR?
-anything suspicious in the log files? https://knowledge.autodesk.com/support/3ds-max/troubleshooting/caas/sfdcarticles/sfdcarticles/How-to-find-and-analyze-your-backburner-error-logs.html
(-if using DR too - DR logs)
-what file format for the saved elements?
-elements from all other slaves are ok?

After updating to 1.3 everything is ok. it was on 1.2.