Problems using AlertDisplayNumber

I've some problems with setting up my *.ini file:
Everything in LivePrompter works like a breeze, except positioning the "Alert" signal on the right display.
I used LP-Diagnostics and it says:

    Reading configuration C:\Torsten's Music Tools\LivePrompterAN\LivePrompterAN.ini

    --- unrecognized parameter in line 6: "AlertDisplayNumber=3"

I tried to enter display number 1 or 2 also with the same result.

So it seems that LP doesnt notice the screen number.
I am using 3 screens under windows 10, with nvidia rtx3060 GPU and MidiAlert is working on screen1, but I need it to show up on screen3.
Any suggestions here?

My ini-file looks like this:
    ; >>>>

    ; >>>> be sure to set the path to your songs directory here

    ; >>>>

    HomeDirectory=F:\Gig Performer\LivePrompter

    ShowCustomComments=0

    AlertDisplayNumber=3



    MidiInPort=Live-Prompter

    MidiInChannel=11

    MidiOutPort=Live-Prompter

    MidiOutChannel=11

    MidiOutPC=no

    MidiOutKeys=no

    MidiInKeys=yes

    MidiInPC=yes

    MidiInKeyPausePlay=CC 15



    ; some basic settings - see documentation for more

    TextSize=38

    TextColor=#DDDDDD

    ChordColor=#FF0000

    ChordsAboveText=yes

    ChordsBold=yes

    ChorusBold=no

    GermanChords=no

    HideChords=no



    StartWithoutButtons=yes

    FooterSize=3

    FullScreen=no

    ScrollToMarker=no

    AutoScroll=yes

    HalfPageAmount=25

    FullPageAmount=80

    ScreenFocus=35

    HideSections=no

    MidiInAlerts=yes

    AlertWindowWidth=250

    AlertWindowHeight=130

    AlertTextSize=36

    FlashDuration=1





    KeyUp={PGUP}

    KeyDown={PGDN}

    KeyPrevSong={LEFT}

    KeyNextSong={RIGHT}

    KeyReset={ESCAPE}

    KeyPausePlay={RETURN}

    KeyUniversal={SPACE}