Like said multiple times BD is very aggressive on our trainers and it will ignore your white list which I think it a very good reason to choose another AV.
However there is not much we can do. To be honest, there is nothing we can do. You either have to stop using the trainers, or deactivate your AV completely (if it helps) or choose another AV, or try to contact BD and tell them how stupid it is that your WHITE LIST is ignored but I doubt they will listen.
Yeah i am leaning towards another AV due to the annoying issues i have had with it, but it is highly praised for its overall performance, any AV you would recommend that you do not seem to have problems with in regards to trainers and editors.
MSE is fine but according to multiple reviews (which I don't fully trust) it's not as many others.
Btw you can try to set an exception for your TEMP folder and see if that helps. The CH loader extract some files there and if you set an exception on the trainer itself it may not work.
Been considering going back to MSE, this AV had some actual stops and good malware blocker, but i need my trainers and editors :P.