K,
did you notice when you clicked on a Pickup/Delivery on my system, (which was a custom layout), that the record you clicked on goes invisible when a window comes up in front.
Its hard to see - you need to click on the body of a pickup/deliv record, and before the Scheduler comes up, you'll see the text you clicked on disappear.
(When the scheduler comes up, just close with window and you can repeat this until you see it)
It was more prevalent when I was using a popup (vs. the VP now opens in a new tab) because what was under your mouse disappears. Seems related in a roundabout way.
If you want, I could modify that to bring up a popup so you can get a good look at the disappeared text. No, its not a Menu going away, but it IS something disappearing when clicking on a A HREF