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TextField works as expected for me. There has been some changes to the way the client and server side implementations of the TextField communication with each other between 6.7.0 RC1 and 6.7.2 so if your widgetset is from an earlier version, there will most likely be problems.
If you are using the bundled DefaultWidgetset, please make sure you have updated the contents of your VAADIN directory (unless you are serving the widgetset directly from the .jar). If you are not using DefaultWidgetset, please ensure you have recompiled you widgetset using the same version of Vaadin as you are using on the server.