Make sure you are using the latest version of ElectronCash... v2.9.4 -
https://electroncash.org/#downloadBCH network had a "hard fork" on Nov 13th... ~block#504,000... it seems that ElectronCash v2.9.3 is unable to sync past block 503,999...
I can't open this wallet in 2.9.4 because client just close.
Yesterday one transaction to Bittrex was send without error. Now it has status "Not verified" in Electron and I have that BCC on Bittrex now.