fr:fields-date Component IE Error

Hi all,

I'm attempting to pre-fill a fields-date component with a string via xxforms:get-request-attribute.  This seems to fill the fields fine, but in Internet Explorer, when changing a field value, I get the following Orbeon error:

"Exception in client-side code.  Message: Unable to get value of the property 'value': object is null or undefined"

Here's the field definition:

<fr:fields-date  id="applicant-dob-control" bind="applicant-dob-bind">
  <xforms:label ref="$form-resources/applicant-dob/label" />
  <xforms:hint ref="$form-resources/applicant-dob/hint" />
  <xforms:help ref="$form-resources/applicant-dob/help" />
  <xforms:alert ref="$fr-resources/detail/labels/alert" />
</fr:fields-date>

The bind:

<xforms:bind id="applicant-dob-bind" nodeset="PersonalDetails/DateOfBirth"
        type="xforms:date" xxforms:default="xxforms:get-request-attribute('applicantDob', 'text/plain')"/>

The relevant part of the model:

<PersonalDetails>
    <DateOfBirth/>
      ...
</PersonalDetails>

The value of the request attribute is the string: "2011-04-15"

I have these properties configured:

<property as="xs:string" name="oxf.xforms.format.output.date" value="[Y]-[M01]-[D01]"/>
<property as="xs:string" name="oxf.xforms.format.output.dateTime" value="[Y]-[M01]-[D01] [h01]:[m01]:[s01]"/>
<property as="xs:string"  name="oxf.xforms.format.input.date" value="[Y]-[M01]-[D01]"/>
<property as="xs:string"  name="oxf.xforms.format.input.time" value="[h01]:[m01]:[s01]"/>

Is this a bug, or am I doing something dumb?