Did an install of WoWRoster v1.9.9.1555 with no issues.
Went to the config area and turned off SQL Queries.
Went to another area of the roster and the SQL Queries re-appeared.
Went back to the Roster config to ensure it was turned off and it was. So, turned it back on, saved, and then off again and saved once more.
It turned off for awhile and then once I went to another area it just keeps coming back on.