It's a Samsung Galaxy Tab Plus 7.0 not quite a year old.
It's running ics. I don't have a custom rom but it is rooted.
Everything I find seems to point to a driver problem but it does connect to the computer fine and even shows as connected to calibre just doesn't display books on the device or otherwise communicate with it. AndI don't have enough knowledge to figure out how to fix it.
In the past I unmounted my sd card to load books, before there was mtp support, and although it would be nice to connect the device directly I can still load books that way.
If you think if anything else please let me know.
I very much appreciate you taking the time to help.