I searched the JIRA and found plenty of Resolved issues for 1.7.2 but no reports for 1.7.4 so please forgive me if this is a duplicate.

The server is running fine. I can post commands and the players see the effects. When I manually open the server.log file I can see the log but the actual server window shows nothing at all. It doesn't show the commands I've input or anything. It's just blank.