Hi macropod,

Thanks for your assistance. I am a heavy Excel user and have been since Windows 3.1 (1993 from memory) so I know my way around it pretty well.

I have a master membership book which in turn feeds into five smaller workbooks for different fields that the association manages on behalf of the local authority. This is all voluntary so I used me Excel skill to automate what was originally a handwritten process taking weeks.

The alphanumeric cells in question are formatted in Excel as General, and this worked in Windows Vista and XP.

So I am at a loss really.

Regards

Tim.