Native mode was broken before (not properly showing the contents of /sbin/ or /cache for example, also changing perms to 777 unnecessarily on file move/edit operations) but on JB4.3 it doesn't work at all. Access to the sdcard is completely broken due to the new isolation of mounts from zygote processes, and editing system files doesn't work, even if mounted rw first.
I'm a paid user and Explorer is long over due for some attention.
-Chris