Ruben’s blog

If you have ever tried to add mx.core.ToolTip (or certain other classes) as a mxml-tag to your Flex project then you might’ve run into the following compiler-error:
“Could not resolve <mx:ToolTip> to a component implementation.”
So why does Flex (or rather MXMLC, the compiler) let you write <mx:Button> and <mx:Canvas> and all those other Flex components, but [...]

At work we ran into this bug the other day, looking into it I found out that Adobe hasn’t put any effort into documenting this one so I thought I’d give it a shot myself in order to try and raise awareness.
In short, the bug occurs with Flash content playing H.264 video in Internet Explorer [...]