"Dave Peterson" wrote:

The first thought that hit me was that DestCPr and oCount didn't make a nice
address.

No, that's not it. The line immediately before it is identical with the
exception that it says .value = "10", which works fine.

The second thought was that that cell already had a comment in it.

This appears to be the problem. But the mystery simply deepens.

This is a brand new spreadsheet, created every day from scratch in the code.
No other code adds a comment, and in fact the sheet that's being worked on
didn't even exist 10 seconds earlier.

Maury