Hey Wayne,
Does your computer happen to have an AMD processor? If so, which model specifically? We’re aware of a very rare issue with a recent Windows 10 update that causes this OS-level error when trying to run FireControl - it seems this update is affecting certain processors.
One user was able to resolve the issue by simply uninstalling and reinstalling FireControl - others have found success by updating their CPU drivers or motherboard’s BIOS. Keep in mind that the latter two are relatively drastic steps; I recommend starting by uninstalling/reinstalling FireControl and see if that resolves the issue for you.
Unfortunately, due to the rare nature of the issue combined with the fact that it stems from a Windows update, at this time all we can do is provide suggestions that might work and collect data that may help us formulate a consistent fix.
@Knick A “child process” is a subprocess created by an application - for example, the visualizer and the DRO are two child processes of the parent process FireControl. The CPU distributes child processes to multiple threads to enable concurrent processing; a child process error can occur when one or more threads have an error.