Has the speed of the reader of the sentences been set to default slow instead of fast?
The speed of the reader used to be fast - and if I didn't understand I was always able to let the turtle repeat. Now the first read is slow and I don't know anymore if I would understand the sentence faster too. If there is no way how the user can set it to their own liking if the default is slow or fast, I really would prefer if it was set to fast.
As I recall, the early lessons had default turtle but then it switched to default fast later on.
Are you working in some of the earlier lessons, perhaps?