1.0.0.4b bug

I found that some computers would appear to be on hold the first time I opened it, but the second time I entered it, it was fine. But my computer could not test this problem, so I made a preventive change. Now if any player continues to have problems with version 1.0.0.4b please contact me, I would like to thank you in advance. I will read every comment carefully, and I will consider every feedback carefully! olist]

Fixed the problem of teacher's speech not appearing on some computers.

Fixed the problem that the first time you open it, it keeps waiting (if you still find it, please contact me)

Fixed the problem that the lesson could be held in the classroom. [/olist]