Thanks for that extra info, Triplets .... what OS versions are installed on the eMacs?
If you have Safari then it must be Mac OS X, but to find out the exact version go to the Blue Apple icon in the upper left of the menubar and select "About This Mac".
So, can you recall whether or not this alert comes as a result of doing something/launching something etc, or is it very random in occurence?
Does the Mac shut down when this alert shows?
Try checking the name of each app you have allowed your kids access to, against the list within the Mac Minder app. If the names of each app don't exactly match then you need to rename them so that they do. Also try dropping each apps icon over the Mac Minder window, onto the section that shows which apps are allowed.
You should look at the log Mac Minder creates of each user and which apps have been used in a session. Then we can take it further.
I'm still searching for info on what C3 is. All I've found so far is a website called
Cubed3 or C3 for short.
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