My stealth-wallet don't send coins in to bittrex, just stay unconfirmed and nothing happens, what i have to do .... !? the wallet have synched, that is no problem, but ....
have you tried backing up your wallet and deleting the whole folder in appdata and the actual stealthcoin folder in c drive or wherever it is you have it, then download the the qt and reinstall it?
this has worked for me in the past with other coins!