What may be with my tablet?

[stodag]

All you need is download mode.. just you can't use Odin as like you said, USB doesn't work.

Anyway, sry I couldn't help more.. gutted good luck.

At least you taught me not to use Google earth again lol

Also, I never had to use USB debuggin at all when using Odin.. and I flashed my galaxy scl about 30 times last year.
However I did have trouble sometimes with the PC detection through Odin.. I downloaded every USB driver under the sun and eventually worked.. Developer mode/USB debug is for adb access to the phone its got nothing to do with Odin or recovery. so no need for USB debuggin.

Regardin the link you gave above, its the same as Odin, Odin's better though.

Inside the Odin folder did you get any files to install ice: drivers etc? install all those.