Tested on Chrome 22, Win7.
Steps to reproduce:
* Click on “All Site Stories”
* Read all the stories
* Click on “All Site Stories”
* If there are no new stories, the River is empty
* Move the mouse in the content area. If the indicator is locked, unlock it
Expected behavior:
* The mouse indicator is horizontally even with the mouse cursor
Actual behavior:
* The mouse indicator stays several pixels beneath the mouse cursor
Video: http://youtu.be/LG12ZP1Smsw