Map link label issues

[erisan500]

hi all,

I have a problem with some of my link labels on a map. On some links the data shows up perfectly (network usage), but other show just "???". Any idea what might be causing this?

The labels in question are:

{X216 Scalance Switch:ifInOctets[Siemens, SIMATIC NET, Ethernet Switch Port 7].last(0)}
and
{MSQLVS01:net.if.in[vmxnet3 Ethernet Adapter #2].last(0)}

Thanks in advance,
Eric