Control of Q-SYS from Crestron Processors may break if a Q-SYS project is upgraded from 9.4 or earlier to the 9.5 versions of Q-SYS Designer software. Q-SYS added features that control permissions of named components, as noted in their documentation, and if the named components are being directly accessed from the Crestron processor they may no longer work without going into Designer and updating the component permissions to allow Script Access. See this excerpt from the release notes:
