Summary:

When sorting the Opportunity Grid using the "Assigned To" field the grid is not sorted correctly.

Symptoms:

For example when using demo data:

Note the users are sorted by the user id (system admin is first) but you would expect they would be sorted alphabetically (starting with Brian Little).

Description 
Status:

This issue has been escalated to development and will be resolved in a future release of Sage CRM

More information:

The reason this is a bug is because if you want to filter your search with the “Assigned To” field it is sorted alphabetically.

Description