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Open the report in design view, select the detail section, bring up the property sheet, click events, then look at OnFormat. Make sure it say's "Event Procedure". Click the builder button to the right (...).
Your procedure with the stop in it should come up.
Also check that the "Has Module" property of the report is set to true.
If all that checks out, then your VBA code project is corrupt. You'll need to use /decompile, or better yet, import everything into a new DB container.
JimD.