two items with keys :
are in unsupported state. the error message is just "Not supported by Zabbix Agent".
both items are passive, "delta per second", numeric (float). they work just fine with zabbix_get and server is getting values, too:
server logs do not show the initial error message. weird thing is, both items get values just fine.
server started at 20150402:151030, thus it's a trunk checkout a couple of minutes before that