Hello Couple, try making sure all Anti-Viruses and Firewalls are closed before attempting to run AVA. Also after this recent Anti-Cheat implementation many programs can no longer be running including keyboard and mouse drivers. I recommend closing as many programs as possible that you don't need, especially those that pertain to your keyboard and mouse.
I suggest Game Booster
to help close most unnecessary programs, however, after running game booster to close those programs I recommend starting task manager and closing the game booster process before running AVA as it may detect it as 3rd party monitoring program.
If your problem is still not solved after that shoot me a PM or reply to this thread saying so and I'll look into this issue further