When using the Allvideos plugin the following actionscript error is thrown:

Error #2044: Unhandled IOErrorEvent:. text=Error #2036: Load Never Completed.

Any guidance on how to resolve this error would be appreciated.

Could you provide us with a link to your site please?

Here is a link to a test:

www.unitedhaulingtruckshow.com/index.php?option=com_content&view=article&id=103&Itemid=189

I cannot see any script error in your page. However, the video doesn't display...
Did you try with another video, to see if it is working? (for example from youtube).

This is a link to a slap together player I compiled using default settings in Flash CS3 with the exact same flv source:
www.unitedhaulingtruckshow.com/media/video/truck_show.html

Here is a youtube test working:

www.unitedhaulingtruckshow.com/index.php?option=com_content&view=article&id=107&Itemid=191

Is the source .swf attempting to analyze the length of the video on load and since it is a large FLV with progressive download perhaps this is triggering the "Error #2044: Unhandled IOErrorEvent:. text=Error #2036: Load Never Completed."

Are errors being captured and dealt with?  something like: addEventListener(IOErrorEvent.IO_ERROR, handleError);

Error captured running IE6 and Flash Player 9

Any chance in getting a peak at the .fla?