Display problem with applications grouped by type (> 20 programs) in KDE4

Issue

• When having multiple windows of the same type open (Eg; xterm or konsole) and having KDE group them by type in the task bar is enabled. If the user opens more than 20 windows of same application, it's being grouped in the task bar.
• Clicking on the task bar button loads the list invisibly. Users cannot see the list of windows for that type but, if they click where the list should be it opens a window.
• Grouped list is invisible on the screen, Users cannot see the list in KDE4.