Flex SDK version 4.5.1 upgrade issue

I recently upgraded from Flex SDK version 4.1.0.16076 to 4.5.1 and this upgrade broke one of the key functionalities in my application.
Wherever the s:DataGroup itemRenderer's s:RichText textFlow has <img> element, it throws the following error in debug Flash player:
TypeError: Error #2007: Parameter child must be non-null.
at flash.display::DisplayObjectContainer/addChild()
at flashx.textLayout.factory::TextFlowTextLineFactory/callbackWithTextLines()[C:\Vellum\bran ches\v2\2.0\dev\output\openSource\textLayout\src\flashx\textLayout\factory\TextFlowTextLin eFactory.as:267]
at flashx.textLayout.factory::TextFlowTextLineFactory/createTextLinesInternal()[C:\Vellum\br anches\v2\2.0\dev\output\openSource\textLayout\src\flashx\textLayout\factory\TextFlowTextL ineFactory.as:245]
at flashx.textLayout.factory::TextFlowTextLineFactory/createTextLines()[C:\Vellum\branches\v 2\2.0\dev\output\openSource\textLayout\src\flashx\textLayout\factory\TextFlowTextLineFacto ry.as:104]
at spark.components::RichText/createTextLines()[E:\dev\4.5.1\frameworks\projects\spark\src\s park\components\RichText.as:1296]
at spark.components::RichText/http://www.adobe.com/2006/flex/mx/internal::composeTextLines()[E:\dev\4.5.1\frameworks\pro jects\spark\src\spark\components\RichText.as:1173]
at spark.components.supportClasses::TextBase/measure()[E:\dev\4.5.1\frameworks\projects\spar k\src\spark\components\supportClasses\TextBase.as:534]
at mx.core::UIComponent/measureSizes()[E:\dev\4.5.1\frameworks\projects\framework\src\mx\cor e\UIComponent.as:8496]
at mx.core::UIComponent/validateSize()[E:\dev\4.5.1\frameworks\projects\framework\src\mx\cor e\UIComponent.as:8420]
at mx.managers::LayoutManager/validateClient()[E:\dev\4.5.1\frameworks\projects\framework\sr c\mx\managers\LayoutManager.as:987]
at mx.core::UIComponent/validateNow()[E:\dev\4.5.1\frameworks\projects\framework\src\mx\core \UIComponent.as:8067]
at spark.components::DataGroup/initializeTypicalItem()[E:\dev\4.5.1\frameworks\projects\spar k\src\spark\components\DataGroup.as:297]
at spark.components::DataGroup/ensureTypicalLayoutElement()[E:\dev\4.5.1\frameworks\projects \spark\src\spark\components\DataGroup.as:352]
at spark.components::DataGroup/measure()[E:\dev\4.5.1\frameworks\projects\spark\src\spark\co mponents\DataGroup.as:1354]
at mx.core::UIComponent/measureSizes()[E:\dev\4.5.1\frameworks\projects\framework\src\mx\cor e\UIComponent.as:8496]
at mx.core::UIComponent/validateSize()[E:\dev\4.5.1\frameworks\projects\framework\src\mx\cor e\UIComponent.as:8420]
at mx.managers::LayoutManager/validateSize()[E:\dev\4.5.1\frameworks\projects\framework\src\ mx\managers\LayoutManager.as:665]
at mx.managers::LayoutManager/doPhasedInstantiation()[E:\dev\4.5.1\frameworks\projects\frame work\src\mx\managers\LayoutManager.as:816]
at mx.managers::LayoutManager/doPhasedInstantiationCallback()[E:\dev\4.5.1\frameworks\projec ts\framework\src\mx\managers\LayoutManager.as:1180]
If I downgrade to 4.1.0.16076, the issue goes away!
Has anyone seen this issue? Any idea on how to fix it? Please help!

I created a new simple Flex project to recreate the issue but I'm unable to reproduce the error condition.
Is there any other way I can provide the needed information? Can you point me to what you refer to as sample test case, so that I can provide you the info in appropriate form.
For what it's worth, here are the screenshots:
With SDK 4.1.0.16076
With SDK 4.5.1:

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Hello,
Please somebody answer my Question.i.e,
For Instance, I downloaded an Application(AIR application) which is developed with Flex SDK 3.0 and AIR Runtime version 2.5. But I have AIR Runtime version 2.0 installed in my machine. What will happen if i install the application? whether it will be installed completely or Any warning will be shown up regarding the AIR Runtime discrepancies? or will the application be obsolete even after it's successful installation?
Did anyone experience it?
Regards,
venks.

Thanks for your help, Flex harUI,
The first impression that comes to mind is that FP version is indeed only for the web browser plugin. Then, why does the official Flex 4.6 mobile development documentation have a link to that page that only speaks about the supported FP version in mobiles under the title "AIR requirements"??
This makes it way too confusing.
Do you know whether there is something like an equivalent matrix/list of mobile devices with their supported AIR runtime versions? I went a great deal in trying to keep my original app under 400kb... I didn't know that in the end it would end up weighing 9.5Mb... :S
Thanks again,

Flex SDK version 4.5.1 upgrade issue

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