If you are opted into running tests and wish to opt out of Beta testing you need to go to GPUGRID preferences,
Unselect "Run test applications?"
unselect "ACEMD beta"
and unselect "If no work for selected applications is available, accept work from other applications?"

You may need to do this for more than one Profile:

Primary (default) preferences
Separate preferences for home
Separate preferences for work

Note that if you opt out of all applications, the settings will automatically reset to include all applications. So you need to select at least one type of task, other than Beta tasks, for the changes to stick.
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FAQ's

HOW TO:
- Opt out of Beta Tests
- Ask for Help