Symptoms
When browsing Home > Operations > Orders > Created order queue only a blank screen with operation button(s) is displayed.
Cause
The root cause is a software issue ID #PBA-68474 ("Cache WWW issue causes order queues to be not displayed").
Resolution
Install the hotfix #127830.
Until the hotfix is installed, WWW container can be restarted as a workaround:
# service pba restart www