can you show me a screenshot of your plugin parameters?
I've downloaded the QABS master demo and got this plugin working within that demo project.
https://github.com/quxios/QMV-ABS-Demo
It's possible you have the "Use On/Off Switch" Parameter set to true and do not have the assigned switch set to true which may be causing this plugin not to function. If the plugin isn't properly configured then it will not function as expected.
The Use On/Off Switch parameter is meant to assign a switch to enable/disable the Active Item System, so that you can have areas where the active item system is disabled. If you have this parameter set to true then you must assign a game switch id in the following parameter and make sure that switch value is set to true.