VBA - Worksheet.activate not working

I was wondering if you could help me figure out why worksheet.activate does nothing in the case below. I turn off

.ScreenUpdating = False
.EnableEvents = False
.DisplayAlerts = False, 

-> create a new file and add sheets to it, -> turn them back on, -> and when i try to activate the new file, it does nothing, and the main file remains active.

Does anyone have a solution for something like this?

Enum getWhat
    getRow = 0
    getCol = 1
End Enum  

Sub main()
    SetProgramAlerts 0
    Set currentWorkbook= ActiveWorkbook
    Set newWorbook = Workbooks.add
    With newWorbook
        Set WS_Project = .Worksheets("Sheet1")
        WS_Project.name = wsProject
        '....
    End with
    SetProgramAlerts 1
    newWorbook.Activate 'this actually does nothing, even though application.screenupdating = true
end sub

Public Sub setProgramAlerts(turnThem As turnThem)
    'TURN EVERITHING OFF AT THE BEGINING OF A MACRO
    'REMEMBER TO TURN BACK ON
    DoEvents
    Select Case turnThem
        Case 0      'All off
            With Application
                If .ScreenUpdating Or .EnableEvents Or .DisplayAlerts Then
                    .ScreenUpdating = False
                    .EnableEvents = False
                    .DisplayAlerts = False
                End If

                If Workbooks.Count > 0 Then
                    If .Calculation <> xlCalculationManual Then .Calculation = xlCalculationManual
                End If
                '.statusBar = True
            End With

        Case 1      'All on in opposite order
            With Application
                '.statusBar = False
                If Workbooks.Count > 0 Then
                    .Calculation = xlCalculationAutomatic
                End If

                If .DisplayAlerts = False Or .EnableEvents = False Or .ScreenUpdating = False Then
                    .DisplayAlerts = True
                    .EnableEvents = True
                    .ScreenUpdating = True
                End If
            End With        
    End Select
    DoEvents
End Sub

I had the same problem. After setting Application.ScreenUpdating = True before sheet.activate everything worked fine.