Are you sure this isn't related to OpenColorIO with Metal compute? (I'm going to assume you use OCIO) The whole OCIO pipeline is currently broken with Metal compute—if you disable Metal compute and switch back to software under the Performance preferences section everything should work fine. I've been opening EXRs produced from various software (with OCIO configured) and haven't had any issues. The developers are aware of this and it should be fixed soon. If that's not the solution to your issue, it would be great if you could provide samples as Gabe suggested so we can have a look. Thanks!