It got fixed later that day with a little update. But It has happened again… This usually occurs when a file or driver on the system doesn’t have a valid digital signature, which Windows uses to ensure the authenticity and integrity of files. I have an antivirus and I can say this is not harmfull. But this guys maybe have named wrongly a file AGAIN…
Atidxx64.dll is categorized as Win64 DLL library files. As a atidxx64.dll file, it was created for use in ATI Technologies Inc. Radeon DirectX 10 Driver by Microsoft. So maybe your problem lies on the incorrect instalation of the Update. Maybe you want to try to repair or reinstall the game. But if we all are playing on PC the best answer can be to wait til the developer team/tech support team fixes the issues