Unfortunately, you switched from rather good to bad. - Never rely on Norton's automated options whatsoever. Always perform exclusions manually as Norton is too dumb even when asked what to do with a certain file. It just saves an ID file signature but will still block this file nonetheless in most cases I saw.
What Windows OS and what security software do you use (please in detail)?
This fixed my issues which is strange because even whitelisting the program in BitDefender didn't do anything. I had to actually disable Advanced Threat Defense like you said. Thank you for the quick response. You're amazing.
You may send the trainer file to Bitdefender and tell them about your issue with it.
This option was disabled by default in the 2017 versions of BD, but now the world has gone really bad so they decided to enable it and put a sticker on.