Its a dojo bug with a fairly simple workaround. Check out http://bugs.dojotoolkit.org/ticket/10491 for more information.
I have the same issue where TextSymbol does not display in IE8. I cannot use the IE7 workaround as we are targeting IE8, IE9, Chrome, FF and have other code that IE7 will not support. I also prefer to use the esri-hosted jsapi, version 2.8 and therefore cannot apply the patch presented in the bug tracker. What are my options? This is still an issue in jsapi 2.8 which is based on dojo 1.6.1.
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