Hello Slav
I had already done as you suggest without success. I have really spent a long time to try and discover what the problem might be.
I have discovered something interesting. In the Timeline How To you sometimes have to click on an object to proceed. If it calls the GoTo action from an event and the item it needs to go to is the next frame or even a frame in the same slide, it does not work. The animation does not continue. This is the case with slides 4 and 5.
If I VIEW the particular frame i.e. frame 2 of both slides 4 and 5, the animation continues. If I set Advance to a specific time so that it does not have to call the GOTO action the whole animation continues as it should.
It seems as though the problem is when GOTO is called from a certain event. If the item to which it should go is another slide or a frame on another slide, it works i.e. if there is an animation it continues.

Strange!!?