Do you see your address?
I have installed the newest 3.0.2 with Windows, the net connection was ok, synch ok, still nothing. Even with the hucked transaction must be in history within seeds, why not?
What for right now?
If you have correct seed which is generated that address you send BTC from exchange then problem is somewhere in Electrum.I suggest you try uninstall Electrum and delete his folder which is located in this path : C:\Users\Home\AppData\Roaming\Electrum and then install again using option "I have seed".
Before you do that you may try to go to same path and delete only "blockchain_headers" file,then give your wallet some time to sync.If you not see your transaction click on green dot and try to select server manually on by one.
Be sure you have your correct seed writen and checked before you do anything.