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Unable to set Automatically log out on idle

On two different MacBooks running Safari 11.0.3, I can no longer set Automatically log out after idle (mins). On hitting Save after ticking and setting a time, I get the message This feature requires the binary version of the extension. Would you like to install it now?
Reinstalling the extension has no effect - the setting remains cleared. This is a new behaviour, as this setting used to work in Safari.

Thanks David