The main window interface of Avast can cause problems on remote access via rustdesk. When the avast interface was on focus. It disables the remote mouse input on rustdesk. Previous versions of avast, works fine with rustdesk remote access. When the interface was closed.
Avast has Self-defense feature that prevents remote-desktop like app from controlling Avast interface. Maybe new version of rustdesk has not yet been whitelisted by Avast.