Form fails when DateField is included

I’m running 6.4.5 and have a POJO wrapped as a BeanItem bound to a Form. As long as I exclude the “expenseDate” property all is well. If I include it the Form does not paint at all and I see the following in the Debug window. This is my first real problem since starting with the wonderful Vaadin UI framework and I’m at a loss as to what could be wrong. Thanks in advance for assistance. - Jon


null
(TypeError): Cannot call method 'indexOf' of null stack: TypeError: Cannot call method 'indexOf' of null at Dhb
 (http://localhost:8787/com.infor.xmcollect/VAADIN/widgetsets/com.vaadin.terminal.gwt.DefaultWidgetSet/86D3ADB8550FAE3CAB8CE3EDC30280A5.cache.html:4171:32) at Chb 
(http://localhost:8787/com.infor.xmcollect/VAADIN/widgetsets/com.vaadin.terminal.gwt.DefaultWidgetSet/86D3ADB85
50FAE3CAB8CE3EDC30280A5.cache.html:3608:33) at zNb 
(http://localhost:8787/com.infor.xmcollect/VAADIN/widgetsets/com.vaadin.terminal.gwt.DefaultWidgetSet/86D3ADB8550FAE3CAB8CE3EDC30280A5.cache.html:3871:58) at ZNb 
(http://localhost:8787/com.infor.xmcollect/VAADIN/widgetsets/com.vaadin.terminal.gwt.DefaultWidgetSet/86D3ADB8550FAE3CAB8CE3EDC30280A5.cache.html:2513:32) at Object.dOb [as Be]
 
(http://localhost:8787/com.infor.xmcollect/VAADIN/widgetsets/com.vaadin.terminal.gwt.DefaultWidgetSet/86D3ADB8550FAE3CAB8CE3EDC30280A5.cache.html:1095:16) at KNb 
(http://localhost:8787/com.infor.xmcollect/VAADIN/widgetsets/com.vaadin.terminal.gwt.DefaultWidgetSet/86D3ADB8550FAE3CAB8CE3EDC30280A5.cache.html:4006:150) at Object.mOb [as Gd]
 
(http://localhost:8787/com.infor.xmcollect/VAADIN/widgetsets/com.vaadin.terminal.gwt.DefaultWidgetSet/86D3ADB8550FAE3CAB8CE3EDC30280A5.cache.html:4307:60) at TFb 
(http://localhost:8787/com.infor.xmcollect/VAADIN/widgetsets/com.vaadin.terminal.gwt.DefaultWidgetSet/86D3ADB8550FAE3CAB8CE3EDC30280A5.cache.html:4385:618) at Object.wFb [as Gd]
 
(http://localhost:8787/com.infor.xmcollect/VAADIN/widgetsets/com.vaadin.terminal.gwt.DefaultWidgetSet/86D3ADB8550FAE3CAB8CE3EDC30280A5.cache.html:3352:83) at Object.iFb [as Gd]
 
(http://localhost:8787/com.infor.xmcollect/VAADIN/widgetsets/com.vaadin.terminal.gwt.DefaultWidgetSet/86D3ADB8550FAE3CAB8CE3EDC30280A5.cache.html:4413:1080) type: non_object_property_call arguments: indexOf

Sounds like a bug. Please create a ticket at http://dev.vaadin.com and add a (minimal) test case that reproduces the problem.