If you are still experiencing these issues deleting the GPU worktable can fix issues like this, It'll be recreated upon next startup of the game. You can typically find it here:

Stand alone:
C:\Program Files (x86)\Frontier\Products\elite-dangerous-64\

Steam:
C:\Program Files (x86)\Steam\steamapps\common\Elite Dangerous\Products\elite-dangerous-64

These locations may vary slightly if you use custom directories.