PX41CX: Strange disply change

[rawi]

Thank you very much for your fast answer.
Yes, the calculator was connected to the computer.
Unfortunately I could not save the program, since CoolTerm did not work. I do not have a standard serial port but only a standard USB interface and I have to learn how to define this as a serial port. So the back up was not possible.

Could you give some additional information how to use CoolTerm?

The reset worked but the program was gone, which I wanted to avoid.