Please could someone suggest why I get multiple versions of my VBA project in
Project Explorer? It's irritating because changes I make to the code in one
"clone" don't have any effect if the worksheet seems to be paying attention
to another one.

It seems to be OK if I consistently enter changes only into the uppermost
version of the project (provided I remember to avoid the others) - but why
are the duplicates there anyway?

Sometimes it goes back to one version on reopening the workbook; currently I
have three identical-looking versions in Project Explorer and I'm worried
that some changes will get lost if I accidentally enter in the wrong clone...