I have not yet upgraded to 1.2.7, still on 1.2.6, but here is information on one of the many devices that are showing up in the root of the tree. This device happens to be a Zebra printer, we have about 50 of them, and as you can see, there is a subnet mask present:
System Name: ZBR4473616
Web Address: http://192.168.12.29
IP Address: 192.168.12.29
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.12.1
Timeout Checking: Enabled
Trap Destination(s): 255.255.255.255
-Kevin C.