I realized that the <af:inputDate> and <af:popup> are causing the problem
For instance, here's a test anyone can do:
Create and run the following jspx page in Jdev 11.1.1.0.0:
<?xml version='1.0' encoding='windows-1252'?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.1"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:af="http://xmlns.oracle.com/adf/faces/rich">
<jsp:directive.page contentType="text/html;charset=windows-1252"/>
<f:view>
<af:document>
<af:form>
<af:panelFormLayout>
<af:inputText label="1 - Type some accented letters"/>
<af:inputDate label="2 - Select one date"/>
<f:facet name="footer">
<af:commandButton text="3 - Click here to submit"/>
</f:facet>
</af:panelFormLayout>
</af:form>
</af:document>
</f:view>
</jsp:root>
In my environment, every accented letter i type in the <af:inputText> becomes � (#65533;)
after i select a date and hit submit
