Is the message one about HazelHelper being an application downloaded from the internet? If so, then this is a bug in the OS having to do with installing Hazel machine-wide. You can move Hazel.prefPane from the top level /Library/PreferencePanes to the one under your home folder, or, if you want to keep the machine-wide installation and are comfortable using the commandline, do the following:
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sudo xattr -d -r com.apple.quarantine /Library/PreferencePanes/Hazel.prefPane/
Note that that command will ask for your password as it needs to run a privileged operation so handle with care.