I have successfully fixed this on my client computers. The steps were as follows. From the management console Client Tab, remove the offline PC. Go to the PC and log in as admin and remove Malwarebytes from the PC through Control Panel/Programs and features. Ensure Netlogon Service is running on PC. From the management console Admin Tab, scan for computers, find the affected PC and do a new Push Install. You will see the PC in the Client Tab again after a refresh. It will show as online.