I tried to cause some strange behaviour and were successful:
When I am on a input line and then press the keys "x^y", "sin", "cos", "tan" one after another, chinese symbols appear on the input line.
There are several combination which lead to similar errors. One more example is "x^2", "+/-", "( )", "," "( )", "+/-" "x^2".
A similar phenomenon is when you type "x^2", "+/-", "( )", "," only two more key presses seem to be accepted and are shown on the input line.
The symbols are not always the same (i.e. they are different depending on whether I am in the CAS or the numeric environment).
The simulator does not show this behaviour.
- Stefan