Description of problem:
This is a followup to bug # 1267866
I finally managed to reproduce this issue manually!

The problem is NOT, that LOADING TASK DATA from the backend takes infinite time, but that the LOADING ANIMATION is displayed indefinitely until user moves the mouse. This happens in 30-50% of selenium tests and I was able to consistently reproduce this manually with remote database.

Observe the problem in video attached.
After clicking some tab (i.e. Active) you can see (in the firebug network panel below) that it takes about 0.5 seconds to do backend request to load task information (this is from DB from Boston lab to my laptop in Brno). But even after the request is finished, the loading animation remains to be displayed. To make it disappear I must move the mouse.

Another problem is that for some tabs, the loading animation is not displayed at all. Instead the table remains empty until user moves the mouse (observe this after clicking Group tab in 0:13 in the video)

I'm not sure if this is a blocker (I'll leave the decision to you), because the tasks ARE displayed after user moves the mouse. But from UX perspective this is very annoying and at least it must be documented in release notes.

Version-Release number of selected component (if applicable):
BPM Suite 6.2.0 CR1

How reproducible:
Always with remote DB

Steps to Reproduce:
0. Configure the server to connect to some remote DB (I can provide private info about how to do it using our DB Allocator tool if needed)
1. Create ad-hoc task in task list
2. Click various filter tabs

Actual results:
After some time clicking the tab headers the loading animation is displayed indefinitely - user has to move the mouse to make it disappear.

Expected results:
Loaded tasks should be displayed WITHOUT user having to move the mouse after he clicks the filter tab.

Additional info:
Information to be added to release notes:
When displaying tasks in task list perspective, it might happen (especially when using remote / slow database), that after clicking filter tab (Active, Group, Personal etc.) there is a loading animation displayed indefinitely and no tasks are displayed. The workaround is simply to move the mouse.