Just tried it now. Looks like everything works.
I still can see the DX50 and external_SD when I connect it to my mac via USB
Shutting it down and power back on while connected via usb also work.
The only thing I notice is on the startup menu when you select between mango and RB, tapping on the screen sometimes doesn't work and appears to hang DX50. I had to shut it down manually and reboot again.
EDIT: Ok I'm not sure what happens but I re-install cwm_rockbox_2014-03-24_v3.zip from the CWM recovery menu. After it reboots. it works flawlessly.
Minor issue on the cwm recovery menu. It appears it is unable to mount the external SD and I have to install cwm_rockbox_2014-03-24_v3.zip from the internal sdcard.
Edited by headwhacker - 3/25/14 at 5:45am