Here's an update:
Checking my supervisor log I see this error for all the jobs in my queue. This example is for the first job ID 250:
ERROR: database query error: 127.0.0.1 via TCP/IP - SELECT command denied to user 'pfx_dw'@'localhost' for table '250subjob' (1142)
SELECT id, status, host, address, data, result, count, retry, seq, macaddress, lastupdate FROM 1qube.250subjob WHERE reserve < 358029399 and status = 320 LIMIT 1
pfx_dw is the mysql user I created to access the qube DB's. I put the username and password in the qb.conf file as detailed in the KB and I was able to start the supervisor and get the farm running:
database_user = pfx_dw
database_password = ******
Researching the MYSQL site I found that the SELECT command error can be a red herring; it throws the error because there is no table called 1qube.250subjob.
Can anyone help me out here?