If the engine or the interface application ask for a system update at every start, then there are some permission issues. For solving this problem please follow these steps:
- Quit the engine and/ot the interface of just:in multi
- Go to /Library/PreferencePanes
- Delete the ToolsonAir pref pane
- Start the engine again
- Enter your pw for the last time (system update)
Then this problem should be solved. If you are still seeing this issue, please create a ticket.