What steps will reproduce the problem?
1. Open "Students" page
2. Click on the control sorting the list of students by student number
Expected result
The students in the list are sorted by student number in both directions.
Actual result
All the students disapear from the list. The numbers of the pages disapear as well. There stays just #1 control under the list and the titles of the columns.
The same test was used for Google Chrome 30.0, Opera 17.0 and Internet explorer 9.0. The results are the same.