lost bitcoin on electrum - wallet closed after transaction went through?
Hmm.. weird. Here is what you can do: Open Electrum, click on on
  wallet, then master public keys. Copy the master public key and paste
  it in blockchain.info/xpub/"your master public key here" without the
  quotes. It will show you all the transactions related to your current
  Electrum seed. Is the 'lost' transaction listed there?


Well, if you are absolutely sure that you saw the transaction in Electrum, and the address has now disappeared even using the same seed. There is only one thing left to do: Submit an issue directly to the Electrum developers. github.com/spesmilo/electrum/issues and mention that you tried with your master public key and didn't find the corresponding transaction.