I don't know why. I changed nothing with my cards. No tweaking with the cards. I'm good with the default settings. But every time I use TRM, my pc always says that Teamredminer.exe is blocked from accessing graphics card. I'm using 18.6.1 for my vega 64. If I use other miners, I don't encounter this problem. What could be causing this?
Make sure to exclude .exe file from your antivirus or windows defender and then you will not have problem.