@ AlexT. To insure the stability of my site and check the original table structure, I have reverted back to 7.0.9. It appears that the table "dolph.sys_objects_member_info" did not exist in 7.0.9. My error messages all indicate this missing table as the source of the problem. If this is a new table in 7.1.0, after the first failed upgrade attempt (from 7.0.9-7.1.0.B1), I checked the database and saw that this table had NOT been created during that process.
Was "dolph.sys_objects_member_info" supposed to be created during the upgrade to 7.1.0.B1 ? I'm hoping for an answer to this before I proceed. As your error-fixing procedures indicate, it is only for experienced users, and your above instructions to me are beyond my expertise. My site is fairly basic, with all non-Boonex modules uninstalled before the upgrade, and I don't understand why I should have had this problem unless it is an issue in the upgrade script.
As an additional note, before I clicked to begin the upgrade process, the final upgrade, from 7.1.0.B2-7.1.0, was not included as a future option.
Thank you very much for your assistance.
Someday, Someway.