The start up and closing screens behave erratically.
This occurs on Mageia 3 & 4 it also occurs with many other Linux's except Manjaro which does not have a graphical start up and closing screen.
I asked the question on Linux Mate forum and the reply was that there is a problem with Plymouth.
The screen I am using is a SyncMaster 151s (set to 1024 x 768, 70Hz)