Electro 4 Impossible to Split the keyboard

[savate]

Electro 4 Split impossible.
Since I am the update of the OS (1.18) I can no longer split the keyboard in the organ section. I intruction the following:

"Hold Shift and press the Preset / Split button
This Activates the organ split mode, the Split LED will light up
The keyboard will be split at C4
The lower half will use the Preset 1 / Lo setting; the upper half will use the Preset 2 / Up setting
If you press and hold Both the Shift and the Preset / Split buttons
for a pair of seconds, the LED will begin to Split flash and you
can press a key on the keyboard to set a new split points as long
Held as thesis buttons are down
The key you press will be the first upper manual key "

360000 I did this time. Can split the keyboard.
Is the OS has a bug?
Who has already experienced this problem and how to solve it?
Thank you for your help.

[Cornopean]

Electro 4 HP, 1.18. All works fine, I cannot replicate this fault.