I do consulting work and use Excel to track my client / project hours.
Date/client/project/hours/billing rate are logged on the first sheet. I have
additional worksheets for each of my major clients with VBA auto activate
procedures that search the first sheet for any references to that particular
client and display any unbilled hours, sorted by project with hour and dollar
sub-totals.

I use a Word document with an embedded spreadsheet object for my invoices.
When I'm invoicing, I use the above-mentioned client specfic worksheet.
Frequently, if I leave the VBA worksheet active when I activate the
spreadsheet object in my Word document, I'll get a message stating that excel
has encountered a problem and needs to close.

I lived with this problem for about 5 years with Office XP. I upgraded to
Office Pro 2007 about a year ago and still experience the same problem.

Any ideas on how to prevent this?