Texture "flickering"

[Cerick]

This is normal. I can't remember the exact explanation, but it's something to do with a lack of real anti-aliasing, I think. Look up FFXIV foliage flicker/shimmer, etc. on Google. It's annoying at first, but trust me-- you'll get pretty used to it. You can turn down the Grass Quality setting to reduce the amount of foliage on the ground, if you'd like.

I would hardly consider a visual flicker on your screen being normal... I do not have any issues at all with flicker or flashing of any kind playing at max video settings. If anything, the issue may be linked to the video card and its drivers. Verify that your video drivers are up to date and if they are, rollback to the version right before the most recent and see if that helps resolve the issue.