hello. it might be that this is connected to an issue with a dialog problem. the training missions start a dialog that sapi has problems with. so if the game "hangs" it might be just waiting for you to make a dialogue choice that it didn't read to you. in that case pressing e.g. 1 or 2 should continue the dialogue and everything should continue working as it should.

In the case of the long wait it might just be a case of a slow computer. In general the time between the announcement and the menu start is the time in which the loading screens are shown. generally this should only take a few seconds, but the slower the pc the longer it can take. if the above solution doesn't work for the muffin games this could also be the case when loading them and it just taking a long time.