Pretty simple to re-do.
1. Open Blender > switch to VSE (Shift+F8)
2. Add any strip (like Scene) and select it.
3. Add a marker and select it.
4. With the mouse over the Marker area, hit X to delete it.
A popup to "Delete Marker", and a popup to "Erase Strip" appear simultaneously, one on top of each other.
Attached picture of how it looks, and here:
http://pasteall.org/pic/show.php?id=34285
Re-doing this is pretty simple, but still added a .blend to ease the job.
Happens on current SVN and on latest release 2.63a.
Ubuntu 12.04, NVIDIA 460 GTX.
Cheers.
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