I am trying the Drag n' Drop demo with IE 8.0 and Windows XP and found a bug. I am experiencing the same problem in my application.
To reproduce the error drag and item from the Source List onto its appropriate drop zone. Whilst dragging move the item in and out of the drop zone quickly.Eventually the drag will be lost and the item is dropped with no errors.
In my application the same thing happens, but I don't have to move the dragged item as quickly over the drop zone which is larger. With my application IE also complains with this error:
Webpage error details
User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; GTB6.3; .NET CLR 1.1.4322; .NET CLR 2.0.50727; InfoPath.1; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)
Timestamp: Sat, 6 Feb 2010 23:11:02 UTC
Message: 'source' is null or not an object
Is there a way to circumvent this problem? I need to have it all up and running for a demo in 2 days...