You created a copy of either the built-in 'My Machine' or 'My Domain' group.
When attempting to run a scan against the machine group you receive the error message:
There was a problem creating the scan instructions. Please make sure the Favorite, Machine Group(s), and Scan Template haven't been deleted by another user.
The ST.Protect.managed log file may also contain an error such as the following:
System.InvalidOperationException: Unexpected predefined discovery filter 'xxx'
Image of message displayed in Protect:
The issue is caused by a defect when creating a copy of the above mentioned machine groups. This will be resolved in a future version of Protect.
Do not create a direct copy of the 'My Machine' or 'My Domain' machine groups.
Instead, go to New > Machine Group, and create a machine group similar to the settings you can see within the aforementioned groups.
For more information about setting up Machine Groups, see this Shavlik Online Help article:
Shavlik Protect 9.1.x