After putting in the sd card did you reboot your box. I am sure that to be able to save the epg to usb/hdd or sd card they have to be in the box before it boots up. Regardless of if they have already been initialised
I could be wrong but what happens if you put the box into deep standby with the sd card in and then reboot.
Yep I rebooted after I re-inserted the SD card and after I popped in the USB flash drive but it didn't help. Before removing/formatting the SD card it was already initialised from my previous Wooshbuild install but it still didn't work right, the box detected the card and mounted it but I still couldn't select it under EPG as a storage option.
With the old Wooshbuilds the card always worked fine after an upgrade. It's not a major issue but it's a weird one