Chris Raffle

FYI: The custom user fields' issue is also a hinderance when installing a custom module via Module Loader.

The Module Loader stalls at Rebuilding Layouts

The Unknown column 'users_cstm.sales_sub_group_c is again due to 

cache/modules/Users/Uservardefs.php

being rebuilt and having 

  'custom_fields' => false

I can get around it by changing the cache file by hand and repeating the QRR which then prompts me to build the tables for the new module, which I execute. I then have to manually add the newly installed module to the Displayed Modules.

A bit of a pain, too painful/risky for production, but it works.
FrancescaS