TS2017 - Executable file blocked despite exceptions


My file vsthost.exe (it's a VST plugin testing utility) in my folder C:\!VST\vsthostx64\ is being blocked (and removed) by Bitdefender TS2017 despite my creating exceptions in AntiVirus > Exclusions >  Add etc.

To be clear, I have created exceptions for the file itself and the folder in which it resides. I have also created an exception for the process.

The relevant lists show checks for both On-access and On-Demand.

On-access scanning and Active Threat Control are both set to Normal.

What is Bitdefender's problem? Could it be that your mother's a ######?