Minecraft server 1.7.2 shows nothing in the Log & chat window

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http://hardforum.com – I'm having a small problem with my nephew's Minecraft server and hope you can help. If I run sever version 1.6.2 Minecraft starts just fine, but if I start 1.7.2, nothing appears in the log and chat window, nor in the server.log file. I've gone to the Minecraft forums and not spotted anything there. Java is up to date, as is WSE 2012. Here's the server.properties file #Minecraft server properties #Wed Oct 30 11:08:47 GMT 2013 generator-settings= op-permission-level=4 allow-nether=true level-name=Huggyworld enable-query=false allow-flight=false announce-player-achievements=t (Hardware)