StockWatcher tutorial & IE8

I read the "Retrieving JSON Data" tutorial ( https://developers.google.com/web-toolkit/doc/latest/tutorial/JSON )
However, the FlexTable widget isn't updated each 5 seconds (only after delete or add new stock) in IE8. In Chrome everything works perfectly.

Can you explain why or give me the link to the document?

Thanks!

gwt-2.5.0.rc2
apache-ant-1.8.4
jdk1.7.0_09

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