So recently after the 3.1 update, I have noticed that sometimes clicking the play button after the launcher finishes loading all the mods, if you click the play button it depresses as if accepting input but nothing happens, you can just keep clicking Play. Sometimes I have to reload the launcher 2-3 times before I can actually get it to start and that is after several minutes of it loading mods. It happened a bit before 3.1 but it was not as constant.