are you Using a passphrase?
If you Do a typo with your passphrase trezor will show an new account, which is - of course - zero.
it is case sensetive...
Thank you!!! This was it. I thought I was entering in the correct password. There is no error msg except a '0.00' balance so it got me all confused.
There is no error message because it doesn't recognise a different password as an error. It just goes ahead and generates a different set of keys with the 'new' password as part of the seed.
If it did know your password (so that it could generate an error message) it would have to store it somewhere and that would be a less secure (and different) methodology.