Kontakt - GUI shrinking when refresh (!) clicked

[holmesAt5]

I've been following Xtant Audio's great video on locking a Kontakt script. See my script below. I have it 99% working but when I close the edit window and click the (!)refresh icon in Kontakt my whole GUI is shrinking. Everything else is working as it should. Any help appreciated.

on init
set_ui_height_px(250)
declare $var
declare ui_slider $slider_hidden(0,1)
make_persistent($var)
read_persistent_var($var)
{set_control_par_str(get_ui_id($slider_hidden),$CONTROL_PAR_PICTURE,"myImage")}
set_control_par(get_ui_id($slider_hidden),$CONTROL_PAR_POS_X,0)
set_control_par(get_ui_id($slider_hidden),$CONTROL_PAR_POS_Y,230)
set_control_par(get_ui_id($slider_hidden),$CONTROL_PAR_ALLOW_AUTOMATION,0)
set_control_par(get_ui_id($slider_hidden),$CONTROL_PAR_HIDE,$HIDE_WHOLE_CONTROL)

if($var<1)
inc($var)
else
set_control_par(get_ui_id($slider_hidden),$CONTROL_PAR_HIDE,$HIDE_PART_NOTHING)
end if
end on