After update konsole to 16.08.0, the transparent background doesn't work, only show the clack background. In profile settings menu, show a warning message in an orange box (my translation to english...): "The konsole started before started the desktop effects. For transparent background need to restart konsole." Close all konsole, and start a new: same problem. After restart OS, fresh boot: same problem. Reproducible: Always Steps to Reproduce: 1. Start a konsole with enabled tarnsparent background. 2. Black screen instead of transparent backround. Warning messages in profile settings. 3. Close all konsole, start a new. Same problem.
Seems this bug fixed after 16.08.0 release: https://github.com/KDE/konsole/commit/a28902e9120798c67844864a11bbe3f1c2549b74
*** This bug has been marked as a duplicate of bug 366368 ***