Happy Christmas !

I wonder if anyone has any clues to this odd behavious in Excel 365, please ?

My Excel installation seems to be fine - several complex Workbooks with many macros are working just fine.

One, though, is not. Here are the symptoms . . .

1. Macros assigned to text-box buttons work as expected
2. Macros assigned to Worksheet code eg Private Sub Worksheet_Change(ByVal Target As Range) are not being triggered
3. When I go to the list of Macros using the button on the Developer tab, none are visible and all the options in the dialog which opens are greyed out.
4. When I open the VBA environment using ALT F11 and go to Tools . . . Macros . . . I get error Unexected error (35005).
5. However if I go to Project Explorer, the Macros are visible as usual in Module1

Grateful for any ideas where to start looking for the problem.

Thanks

Have you allowed Macros in your set up. Go to File Account Options Trust Center Allow Macros

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Alan עַם יִשְׂרָאֵל חַי

Good thought Alan, thank you. Sadly Macros are allowed

I've recreated the Workbook. All's well.
The old one must have been corrupt - no idea how that happened !