No, the textures slide a bit when mapping is on, when it's off they are all fine.
I can't reproduce what you're seeing,
Hm, does this happen on freshly placed blocks without symmetry lines? I'm starting to think this may be a side effect of the latest tangent fix* for our normal mapping.
*Roughly speaking; we had some normal mapping errors that were fixed and now display correctly. However it exposed the way we rotate blocks doesn't play nice with our normal maps.
Tangent space maps are used purposely to work within scenes where the objects move and rotate independently to each other, but i
think we're rotating the textures
after all the normal calculation is done, giving us wonky lighting information depending on how they are rotated.
Because shield blocks can't be rotated under normal circumstances, i wonder if it's a placing error from copy / paste or symmetry.