And a little hard to explain.
This has followed me through several versions of Vegas and several PCs, so it's not WinXP or Vista or my old Dell box or version 7.0b, it's just Vegas.
On occasion, moving my mouse around the timeline doing my thing, a little popup pops up and if I had decided at that moment to click and drag something on the timeline, what actually happens is that I click something invisible and drag it INTO my timeline. The pics below show what happens at that moment.
The popups appear to be the typical Windows description thing that happens in Explorer, but in this case, it's popping up from what appears to be the Project Media window.
Anyone else seen this?