Dear Nephron,
Same problem on an AC 6.6.5 network. Users get false message that an upgrade requires running the database tuner, no one can log onto AC.
Just restarting the server fixes it.
But the problem comes back randomly.
Better solution is to stop and re-start the main SQL service for Amazing Charts (not the Agent) on the server through services.msc.
Running AC on lots of stations (14 at example office) can confuse the AC SQL service. New logons get the false run-tuner message. Task manager will show lots of RAM use on server. Stop and restart AC's SQL service, RAM use drops, users can log on to AC again without false run-tuner message.
Set task scheduler to run 2-line batch file daily after hours:
net stop "SQL Server (AMAZINGCHARTS)"
net start "SQL Server (AMAZINGCHARTS)"
Cheers,
Carl Fogel
