I'm really just wanting to know WHY this doesn't work, although solutions are
always welcome. Here is the code:

Private Sub ComboBox1_Change()

Dim MaxEEs As Long, LastEERow As Long, TotalEEs As Long, ClientStart As Long
Dim ClientNum As Integer, EEList As Long, AllClients As Range

MaxEEs = Worksheets("Employees").Range("P1")
LastEERow = MaxEEs + 2
With UserForm2.ComboBox2
.AddItem ("All Employees")
If UserForm2.ComboBox1.ListIndex = 0 Then
TotalEEs = MaxEEs
ClientStart = 1
End If
ClientNum = Val(Left(UserForm2.ComboBox1.Value, 4))
AllClients = Worksheets("Employees").Range(Cells(3, 1),
Cells(LastEERow, 1))
ClientStart = Application.WorksheetFunction.Match(ClientNum,
AllClients, 0)
TotalEEs = Application.WorksheetFunction.CountIf(Worksheets
_("Employees").Range(Cells(3, 1), Cells(LastEERow, 1)), ClientNum)
For EEList = ClientStart To TotalEEs
.AddItem (Worksheets("Employees").Range("A2").Offset(EEList , 2))
Next EEList
End With
End Sub

Whenever you select a company from combo box 1, this is supposed to fill
combo box 2 with all of the selected company's employees. 100% of the time,
the number of the selected client (ClientNum) WILL be found on the
"Employees" sheet. But every time I run it, it gets to the
WorksheetFunction.Match line and gives me this: "Application-defined or
object-defined error".

As I mentioned, I'm really wanting to know why this doesn't work, so I can
avoid doing it in the future. But any code corrections are also appreciated.

Thanks.