I assume your PC is set to use a comma (,) as a decimal-point, rather than a full-stop (.)
so you type [1,2;3,4;5.0]
I have it set to a full-stop (.)
So I can type [1.2,3.4,5.0]
At what point do you get the failure ?
What keyboard are you using? on a UK / USA layout the [ and ] keys are to the right of the top row of letters.
Do you need to shift/alt+ to get a ] ?