Damn. After switching to v6.4, Root Explorer is broken again. This seems to be a direct result of certain ROMs that cause the same symptoms.
They are:
Unable to move files from one folder to another, even in the SDCard
Unable to mount RW after leaving the root directory.
Mounting RW in the root directory results in it showing that RW is mounted, but you are still unable to make any changes, such as moving files, deleting files, or npasting new files into directories (this applies to both the SDCard as well as the phone directories).
You ARE able to change permissions.
Used/Free space doesn't show up at the top like it should.
In order for ANYTHING to work like it should, you have to open Terminal Emulator, and mount RW manually. Even after doing that, it still doesn't show Used/Free Space.
Things I've tried:
Forced SuperUser to forget Root Explorer, then re-allowed upon re-opening Root Explorer. No joy.
Deleted Dalvik Cache for Root Explorer.
Deleted all cache and data for Root Explorer.
Deleted Root Explorer altogether and re-installed. Still no joy.
I have also made sure to reboot the phone after every attempt to restore it to normal operation (ie. after deleting cache, reboot. After deleting apk, reboot, re-install, reboot.). Nothing seems to be working, here.
It wasn't working right in v6.2, but it worked fine in v6.3. Now it's stopped working in v6.4 again.
If anybody has any ideas on what might be the problem, please send them my way.