Grab the latest bug fix for YouTrack 7.0 (build 27676) and upgrade today to enjoy the latest version.
This build brings a number of fixes for Agile Board, usability problems and some performance improvements.
Check the Release notes for more details.
If you use YouTrack 7.0 Incloud, your server was upgraded today, on Monday, October 10, 2016 according to our Maintenance Calendar.
JetBrains YouTrack Team
The Drive to Develop