OK, my defective N7 has been replaced with a new one, yeh!

I've rooted it using the toolkit, and as far as I know I'm rooted.

I have Stick Mount installed, but I can't see my micro Sd card?
Stick mount says 'The mount service is busy - try again in a few seconds' when I select mount or Unmount.
I upgraded to Stick Mount Pro but nothing has changed.
Does this mean I'm not really rooted? How can I tell?

Using Nexus Media Importer I can see the SD card in my USB hub and I can read and play music files etc.

How come I can't find the SD card storage using ES File Manager, X-plore etc?

What settings do I have to change?

Thanks

Chris

Brand new Nexus 7, battery fully charged.

Notifications indicate an Android system update is available, but when I select it I get the message:

"Battery too low to install system update. Wait for battery to charge sufficiently."

I'm not that worried, in view of all the problems apparently associated with the 4.2 update , but I am worried that system updates are going to fail?

Thanks

Chris