I fixed the problem. Thanks for looking!
For those that are curious, the new code is as follows:
Sub BreakOnSection()
' Used to set criteria for moving through the document by section.
Application.Browser.Target = wdBrowseSection
'A mail merge document ends with a section break next page.
'Subtracting one from the section count stop error message.
For i = 1 To ((ActiveDocument.Sections.Count) - 1)
'Note: If a document does not end with a section break,
'substitute the following line of code for the one above:
'For I = 1 To ActiveDocument.Sections.Count
'Select and copy the section text to the clipboard.
ActiveDocument.Bookmarks("\Section").Range.Copy
'Create a new document to paste text from clipboard.
Documents.Add
Selection.Paste
'Select first line of document to use as file name
With Selection
.HomeKey Unit:=wdStory
.EndKey Unit:=wdLine, Extend:=wdExtend
.MoveLeft Unit:=wdCharacter, Count:=1, Extend:=wdExtend
End With
sName = Selection
' Removes the break that is copied at the end of the section, if any.
Selection.MoveUp Unit:=wdLine, Count:=1, Extend:=wdExtend
Selection.Delete Unit:=wdCharacter, Count:=1
ChangeFileOpenDirectory "C:\???"
DocNum = DocNum + 1
ActiveDocument.SaveAs FileName:="" & sName & ".htm", FileFormat:=wdFormatHTML, LockComments:=False, Password:="", AddToRecentFiles:=True, _
WritePassword:="", ReadOnlyRecommended:=False, EmbedTrueTypeFonts:=False, _
SaveNativePictureFormat:=False, SaveFormsData:=False, SaveAsAOCELetter:= _
False
ActiveDocument.Close
' Move the selection to the next section in the document.
Application.Browser.Next
Next i
ActiveDocument.Close savechanges:=wdDoNotSaveChanges
End Sub