Found the same problem after an iDRAC Firmware update. To rectify I created a new user account and reapplied permissions. Seems the "Access Virtual Console" permissions even when ticked are not actually applying post update.
Hello, whenever i attempt to  launch video console from idrac 7, it fails with an error "Access Denied"  This is weird because i am logged in to idrac as the root user. i am using JDK 1.6 . I have tried through different browsers and i still get the same error.
iDRAC 7 Launch Virtual Console fails with Access Denied Error