Workbook w/Macro Embedded within Word: Macro fails to execute (more see description)

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Excel Workbook with digitally signed macro (important?)

Workbook in Excel
- Macro works as expected

Embed workbook in Word

Enter Excel, change data, run macro, exit Excel
Enter Excel, change data, run macro, exit Excel
Enter Excel, change data, run macro, exit Excel
....

Save Word document
Exit Word
Start Word
Open document

Enter Excel, change data, run macro, get message:

Microsoft Office Excel cannot access the file 'Worksheet in C:<open document name>'
There are several possible reasons:

The filename or path does not exist.
The file is being used by another program.
The workbook you are trying to save has the same name as a currently open workbook.

Excel and Word are 2007

I'm I doing something wrong or is this a bug in a tux? (An unintended feature?)

 

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Resolved: The button I was using to execute the macro was a Form button, when I changed it to an ActiveX button the problem went away.