Steps to reproduce:

1. en the zabbix root directory
2. initialize the fronted test environment: ant init-frontend mysql
3. execute the test: cd ui/test; phpunit --bootstrap=bootstrap.php selenium/testPageDashboard.php

Result:
During the test, when the Filter button was clicked, the filter area was disappear, and then the case could not find any element what it expected, finally the case run failed.
Expected:
the case run successfully