I tried to re-add some devices, for example a Catalyst 2980 GA (1.3.6.1.4.1.9.5.51) and a Catalyst 2948 G (1.3.6.1.4.1.9.5.42). Would some logs be of any interest?
If you could send the getDeviceData.log file as well as the IP numbers of the devices in question that would be helpful.
-- Kristian