Can you give the steps for making the EXR, starting right from where you are in Max? E.g. is this "Render, save to EXR from Max, open in CIE, edit the Lightmix, save to CXR from CIE, this CXR from the CIE is no longer valid though the one saved from Max was fine" ? Also can you send in the CXR before and after CIE editing (ie working vs. broken) - this can be done by opening a ticket at support.chaos.com and using "Submit a Request" (include a link to this forum post in the request, and attach the file to the request). Meantime, are you sure the CIE was updated when installing the latest daily, what version does the CIE say it is? Thanks!