I am seeing this in the log under beta 1. I did not get these errors with alphas 1, 2, or 3 or any previous release. This is on a RT-AC68P. Elements_HFS is actually ext4. It used to be HFS+ but I recently changed it last week.
Jun 19 17:00:31 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.__admin_var.txt"): not an adouble
sx file
Jun 19 17:00:31 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.___var.txt"): not an adouble
sx file
Jun 19 17:00:31 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.__folder_list.txt"): not an adouble
sx file
Jun 19 17:00:32 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.__admin_var.txt"): not an adouble
sx file
Jun 19 17:00:32 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.___var.txt"): not an adouble
sx file
Jun 19 17:00:32 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.__folder_list.txt"): not an adouble
sx file
Jun 19 17:00:47 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.__admin_var.txt"): not an adouble
sx file
Jun 19 17:00:47 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.___var.txt"): not an adouble
sx file
Jun 19 17:00:47 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.__folder_list.txt"): not an adouble
sx file
Jun 19 17:01:15 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.__admin_var.txt"): not an adouble
sx file
Jun 19 17:01:15 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.___var.txt"): not an adouble
sx file
Jun 19 17:01:15 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.__folder_list.txt"): not an adouble
sx file
Jun 19 17:01:15 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.__admin_var.txt"): not an adouble
sx file
Jun 19 17:01:15 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.___var.txt"): not an adouble
sx file
Jun 19 17:01:15 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.__folder_list.txt"): not an adouble
sx file
Jun 19 17:01:21 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.__admin_var.txt"): not an adouble
sx file
Jun 19 17:01:21 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.___var.txt"): not an adouble
sx file
Jun 19 17:01:21 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.__folder_list.txt"): not an adouble
sx file
Jun 19 17:01:31 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.__admin_var.txt"): not an adouble
sx file
Jun 19 17:01:31 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.___var.txt"): not an adouble
sx file
Jun 19 17:01:31 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.__folder_list.txt"): not an adouble
sx file
Jun 19 17:01:42 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.__admin_var.txt"): not an adouble
sx file
Jun 19 17:01:42 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.___var.txt"): not an adouble
sx file
Jun 19 17:01:42 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.__folder_list.txt"): not an adouble
sx file
Jun 19 17:02:31 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.__admin_var.txt"): not an adouble
sx file
Jun 19 17:02:31 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.___var.txt"): not an adouble
sx file
Jun 19 17:02:31 afpd[1350]: ad_valid_header_osx("/tmp/mnt/Elements_HFS/.__folder_list.txt"): not an adouble
sx file
J