@Avictory next to the scenario you played there should be a little play button. If you click on the scenario you played there should be an option to resume game the game in the lower right corner of your screen.
Same OS and browser here. I don't have a problem as bad as you, the game usually starts fine but as the game progresses sometimes I stop being able to accept other players trades. No issues with buying cards or initiating trades.
tnx