You used the restore option I assume?
Do you have connection ?
Is your wallet secured by a passphrase ? does this unlock the wallet correctly for you?
Did you confirm, the address with balance on it, is actually in the Electrum software, see "addresses tab" ?
Do you happen to have also the private keys, from the addresses with balance on it?
here is a screen shot of my wallet. I just clicked on restore wallet, put my seed in and there i am. No coins. i checked if the seed was exactly the same and it is. I have no idea what i'm doing wrong.
Now make sure you also own the private keys from your addresses with balance on it, as whatever happens to your seed/passphrase/electrum server etc/wallet dat file, with the priv key you always get your coins back.