Excel VBA is blocking the Ribbon

I have made a .xlam file that holds some macro's. I use these macro's as a button in my ribbon. Most of these macro's are opening other Excel sheets. But whenever I use that macro's the ribbon is blocking, I can not use any of the tabs or the buttons in those tabs.

Does anyone know why this happens? This is an example of the code that I added as a macro in the ribbon.

Sub OpenBureauplanning()

    Application.ScreenUpdating = False

    Dim Path As String
    Path = "J:\Planning\Bureauplanning\"

    Dim openfile As String
    openfile = Path & "Bureauplanning.xlsm"

    Workbooks.Open (openfile)

    Application.ScreenUpdating = True

End Sub

After the replies from Dai. I removed the part "application.screenupdating" then its working fine.

In a different code, I use a form to determine which file needs to be opened. I also use that code in my ribbon.

That code is this:

Sub OpenProjectplanning()
Open_projectplanning.Show
End Sub

When running this code these forms get opened. In this form, people fill in the project number from the file that needs to be opened.

When the button "openen" is pressed the following code is starting:

Private Sub CommandButton1_Click()

Dim Path As String
    Path = "J:\Planning\Projecten\"

Dim File As String
File = TextBox1.Text

Dim openfile As String
    openfile = Path & File & ".xlsm"

    Workbooks.Open (openfile)

Unload Me

End Sub

When opening the project file this code is automatically running on open:

Private Sub Workbook_Open()
Application.ScreenUpdating = True
Application.Calculation = xlCalculationAutomatic
Application.EnableEvents = True
Application.DisplayStatusBar = True
ThisWorkbook.Worksheets("Planning").Activate

End Sub

After running these codes, the ribbon is blocked.