Oracle Sql Developer换成Windows主题后不能显示窗体的解决方法

安装了最新Oracle11g R2版，打开Sql Developer，发现界面跟以前不一样了，不是很习惯，偶然发现设置里可以换主题，于是换了个Windows主题，结果就是只看得到任务管理器里的进程，却始终不出来界面。于是猜想这肯定是写在配置文件里的，到安装文件夹下去一个个找，还是没发现。无意间搜到一个老外的文章，说的正是这个事。

下面是引用的原文：

You can reset the system to factory defaults by deleting the system folder in the C:\Documents and Settings\<your connection>\Application Data\SQL Developer\ This is a bit radical as it will delete your connections and any other settings you have made. I'm assuming you have not got a backup of your connections.
      You can just delete the preferences file. This is in that system folder in a directory \Application Data\SQL Developer\system1.5.5.59.69\o.sqldeveloper.11.1.1.59.69 and the file is product-preferences.xml
      Have SQL Developer closed when you do this and restart it after you have deleted the file.

但是我找不到，可能他说的是XP系统，最后，我找到了这个目录：

C:\Users\<name>\AppData\Roaming\SQL Developer

然后到这个子目录\system1.5.5.59.69\o.sqldeveloper.11.1.1.59.69\ ，删除里面的product-preferences.xml文件，重启动Sql Developer，大功告成，谢谢老外~