Trusted device not remembered

I'm a home user who only uses the prog once every few months.

Each time I do however, I find that the trusted device status on my home pc (the main one) has been forgotten.

I do use cCleaner regularly, so it may well be wiping the settings.

Is there a cookie location (I haven't been able to find one yet) that I should be protecting, or is there some other way to ensure that it stays.

I cannot see anything in Options, or in the community.

I'm using V12 on a Win10 64 PC.

Thanks