It might be there are Splunk processes that are hung in memory. Subsequently, the MAC OS is waiting on them to close before you can reopen Splunk. Have you tried opening “Activity Monitor” (from Finder App - Application->Utilities Folder->Activity Monitor) and looking for any open Splunk processes? Then from here you can select them and click the ‘Quit Process’ button on the top left-hand corner to close.
If you want to use Terminal, try running command: ps -ef | egrep “Splunk” to look for open processes, then run command: kill -9 {PID of the spunk process} to force close. Or if not a admin, command: sudo kill -9 PID.
