My transaction have not gone through for a day. After checking status they were not found but I waited. Gwei was set to fast. Tried sending again but it wasn't allowed. It takes days now or what is the problem?
I don't know the real situation of your MEW but i have experienced that one too and the fix is i used Metamask where i export the private key to Metamask and i made my transaction, everything is ok since that one.