I have thedude setup to show speeds on all links, wireless and ethernet.  Recently those link speeds do not show. When I try to remap the links, the interface pull down says unknown and I am not able to select and interface as no interfaces show in the link configuration.  I am logging into TheDude Server from a remote location.  All devices show, and CPU and disk space is showing as configured but no Link performance.  I have two remote monitoring devices, one windows and one Linux and the behavior is the same on both.  TheDude 6.35.4 server running on x86

Are u using the snmp or routeros to collect the data performance? I think u probably forgot to change the password on device configuration.