Steps to duplicate
- Navigate to http://stackexchange.com/leagues/11/week/cooking (shows current week)
year(shows Year 2010)
Bug: Now shows "Week of Dec 28, 2009" at the URL: http://stackexchange.com/leagues/11/week/cooking/2010-01-01
Step 3 should return me to the week I was previously viewing, not to the first week of the previous time frame.
This occurs for all time frame navigation but is demonstrated most effectively with the above steps.