Excel 2007 :: Macro Skipping Dim Statements?

I tried sending this message once before but the system crapped out. At least on my end. If it was sent and this is a partial duplicate. At any rate, as most of you know when an Excel workbook has a large number of merged fields Excel sometimes changes all the cell (not just the merged cells) formats to a Date type, with the exception of those cells that are the Text data type. I found the following code on the net someplace and I can't properly cite the author, that when run resets the cell formats to the default format which is General for all those that had been changed.

Sub CleanStyles()
Dim sty As Style, wbTemp As Workbook
' First, remove all styles other than Excel's own.
' they may have arrived from pasting from other workbooks

[Code]....

This code worked for months. However, it no longer works. I opened the code in the VBA editor and stepped through it using F8. The first time I pressed F8 the first line in the code is highlighted, just like always. The next time I pressed F8 the third line of code (not counting the remarks or blank lines) is highlighted. It did not highlight the Dim statement.

I'm using Excel 2007 in XP.