As mentioned in another thread http://forums.dlink.com/index.php?topic=13200.0
there seems to be a problem using the DP-300U from Windows 7.
I am using the 64 bit version.
LDP support is activated
LPR device configured or alternatively TCP/IP-Device.
The webserver dialog of the DP-300U indicates that jobs have been received but no printing happens.
Printing from an XP computer works as expected.
Firmware of the DP-300U is 2.10.
Boris