The editable grid no longer accepts entry of GUID's. When trying to manually enter one into the data gir, it gives the error "Invalid cast from 'System.String' to 'System.Data.SqlTypes.SqlGUID'".
Log into database. Access/create a table that has a unique identifier datatype column. Run a query for that table in the editor and bring up the datagrid. Add a record to the table, put in a guid value for the new record (manually through the data gird).
In 6.1 this will give the error. In 6.0 and older, this will not error out and the value can be posted and committed.
STATUS:
Waiting for fix in a future version of Toad for SQL Server.