Default [Q] utimes error using unisonsync

I have been using unisonsync to sync files for several months, but have run into new problems after upgrading to kitkat. unisonsync now fails with error messages like

Operation not permitted [utimes(/storage/extdSdCard/filename)]:failed: error in setting modification time

This happens even after rooting and using SD Fix. I have been wondering if remounting the sd card appropriately would help, but I'm not sure how to do this. Any help on this would be appreciated, including direction to another forum.

My tablet:10.1 2014 SM P600, kitkat, rooted, with SD Fix appliedI