There was an AIRAC update 20 April 2023 with a corresponding SD chart update. Later on the same day there was another SD South Africa chart update.This latest chart does not display correctly at various different zoom levels. In particular in the Johannesburg area and to the south, although the fault can also be reproduced over most of SA.
As an area is zoomed in using the + selection the chart changes from topographical information to block squares. Continuing zooming or pinching can sometimes get the terrain data to appear, although not always.
Deleting and reinstalling the chart makes no difference. The terrain to the south of JNB is high and a fix soonest would be appreciated. Thank you.
SD 3.16.7.359 iPad Pro (11 inch. 3rd generation) iOS 16.3.1