A fix for ARD clients dropping

I've had this issue for a while and haven't looked to see if anyone else came up with a solution, so if you're having this issue where your ARD clients start dropping out of your list i.e. "All Computer" try this.

1. Close ARD
2. Open Terminal, type: sudo dscacheutil -flushcache
3. Enter your admin pword.
4. Open ARD and see your missing clients return.

Hope this helps.