Can't see Japanese lable in yAxisName

[prizker.ilia]

I put Japanese labels in chart.

All labels are output correct except yAxisName.

Here is the xml of the chart :

<chart formatNumberScale='0' slantLabels='1' labelDisplay='Rotate' decimals='2.0' borderColor='616365' imageSave='1'

  borderThickness='1' labelStep='0' imageSaveURL='DownloadServlet?req=2' bgAngle='270'

  subCaption='1??2'

  yAxisName='3??4'

  xAxisName='5??6'

  Caption='7??8'

  showShadow='1'

  showValues='0'>

 <categories>

<category toolText='10/14/2008' label='10/14/2008'/>

 </categories>

 <dataset seriesName='???????' color='70B2E6'>

<set link='j-sendDrillDown("fromDate&&20081014,toDate&&20081018,classifier&&1001501")' value='407697'/>

 </dataset>

</chart>

in yAxisName I get 34 lable and not 3??4.

Thank you !