This bug has been present since 8.0 RTM. I was hoping that 8.1 would have the issue resolved, but I have confirmed that the problem still exists.
- log in USER1
- move taskbar to secondary monitor
- log off USER1
- log in USER2
- move taskbar to secondary monitor
- log off USER2
- log in USER1. [TASKBAR IS ON SECONDARY MONITOR AS EXPECTED]
- switch users; log in USER 2. [TASKBAR IS ON SECONDARY MONITOR AS EXPECTED]
- switch users to USER1. [TASKBAR IS ON PRIMARY MONITOR - bug]
- switch users to USER2. [TASKBAR IS ON PRIMARY MONITOR - bug]
It seems to be switching from one active user to another active user that resets the taskbar location. This is a fairly easily reproduced issue, and seems like a genuine problem.