Old Flex App suddenly has an error?

We have several custom Dashboards we wrote in Flex 3 several months ago which are deployed with various customers around the country. Haven't done anything in Flex for about six months, until recently when I was tasked to customize another one of these Dashboards for a new customer.
Much to my surprise I found that when I ran my Dashboard from Flex Developer I get an error, apparently due to a drawing method drawRect(). Luckily for me this error only appears when I run from Flex Developer, when I compile the App it runs fine.
I now need to determine the source / cause of this error, which apparently is being caused by one of the Components we use in the Application, some Degrafa stuff and a Treemap component to which we don't have all of the source code. I may have to find the answer in some other site (where we found the components) but I'd like some insight into what is happening here.
I would also very much like someone more skilled than I am with Flex (I am a beginner Flex programmer myself) to explain to me why an Application which worked fine for almost a year would suddenly develop a problem in the code which did not exist before? This kind of thing would not happen with the other software development tools we use.
This is the error I got.
ArgumentError: Error #2004: One of the parameters is invalid.
at flash.display::Graphics/drawRect()
at mx.skins::ProgrammaticSkin/drawRoundRect()[C:\autobuild\3.2.0\frameworks\projects\framewo rk\src\mx\skins\ProgrammaticSkin.as:739]
at mx.skins.halo::TabSkin/updateDisplayList()[C:\autobuild\3.2.0\frameworks\projects\framewo rk\src\mx\skins\halo\TabSkin.as:397]
at mx.skins::ProgrammaticSkin/validateDisplayList()[C:\autobuild\3.2.0\frameworks\projects\f ramework\src\mx\skins\ProgrammaticSkin.as:421]
at mx.managers::LayoutManager/validateDisplayList()[C:\autobuild\3.2.0\frameworks\projects\f ramework\src\mx\managers\LayoutManager.as:622]
at mx.managers::LayoutManager/doPhasedInstantiation()[C:\autobuild\3.2.0\frameworks\projects \framework\src\mx\managers\LayoutManager.as:677]
at Function/http://adobe.com/AS3/2006/builtin::apply()
at mx.core::UIComponent/callLaterDispatcher2()[C:\autobuild\3.2.0\frameworks\projects\framew ork\src\mx\core\UIComponent.as:8628]
at mx.core::UIComponent/callLaterDispatcher()[C:\autobuild\3.2.0\frameworks\projects\framewo rk\src\mx\core\UIComponent.as:8568]
Any help would be veyr appreciated.
Jean

This is my TabNavigator statement:
<mx:TabNavigator
x="50" y="15" width="94%" height="90%" backgroundColor="#FFFFFF" horizontalAlign="center" tabWidth="
{this.width * 0.32}" creationPolicy="all">
Is the tabWidth a problem now possibly due to some change in IE 8?
D

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