Variable Not Defined during exit

During exit, and after save occurs, I get "Compile error: Variable not defined". The VS window appears, and the name of one of my form controls is highlighted. There are four ActiveX form controls on the worksheet: two labels and two drop-down lists, and event handlers for the drop-downs. A different control name can be highlighted on different exits

Why is there compilation at this point? What can I do? Here is sample code, I can see ddlYear or lblDept flagged.

Private Sub ddlDept_Change()
  If m_bolBlockEvents = True Then Exit Sub

  If IsNull(ddlDept.Value) Or ddlDept.Value = "" Then
    lblDept.Caption = "All"
    
  Else
    lblDept.Caption = ddlDept.Text
    If ddlYear.Value = "" Then
      lblYear.Caption = "All"
    End If
  End If

...

Hello jmc19,

Welcome to the Forum!

To help you with this problem you post a copy of your workbook.

How To Post Your Workbook

1. At the bottom right of the Reply window, Click the button Go Advanced
2. At the top of the Your Message Window, in the first row of icons, Click the Paperclip icon.
3. Click the Add Files button at the top right in the dialog box. This displays the File Manager dialog.
4. Click the Select Files button at the bottom middle of the dialog.
5. In the new window Find the file you want to upload, select it, and Click Open.
6. You will now be back in the File Manager dialog. Click the bottom Middle button Upload File.
7. Wait until the file has completely uploaded before you exit the File Manager dialog.

See attached zip. I've striped the app down to a single report worksheet and switchboard. As you will see, this is my first Excel app. Developed last summer with 2010, now used with 2013.

Oddly, I got a 90% compression rate when I zipped the .xlsm file. Is that a sign of something wrong?

Start the app, open the first report, change the Department drop-down, close the report, exit the app. Error appears while app is closing.