> Is this a known issue and is there a workaround or fix on the way?
Not that it helps a lot, but I can replicate this issue with a link styled with the CSS you supplied within Dreamweaver CS4's Live View (which also uses a version of webkit for rendering). I couldn't replicate it with Chrome on Windows Vista, so this may have to do with the particular version of webkit that's being used, or it may be that some browsers simply don't respond fast enough to very quick mouse movements.
| WebAssist Extensioneer
| Adobe Community Expert
I've had the same issue (if the mouse leaves the application too quickly mouseout events aren't triggered).
In one of my apps I display custom tooltips and it's super annoying to have them laying around.
I use a timer to test for their presence (triggered on mouseover) and remove them after a bit if a mouseout hasn't been triggered. Fine for my purposes but weird for a lot of other things.
I think it's worth reporting here: http://www.adobe.com/cfusion/mmform/index.cfm?name=wishform