http://imgur.com/Wcf0U0F

This occurs for Coal and Iron dense ores. I haven't found other ores yet and am not on creative.

MC: 1.10.2
Forge: 12.18.3.2185
DO: 1.11.alpha.1.0.0

Update: Looks like it's specifically with the Sonic Ether's Unbelievable Shaders. I'll attempt to contact him about this as well.

I have exactly this issue, and I do not use SEUS. I use SFLP, another shaders mod.

@rwtema Could you please reply? It’s been nearly a year without any input.

I wish the mod were OptiFine-compatible, though. I love this mod, but I can’t live without OptiFine and shaders.

The textures for the dense ores are dynamically generated from the base ores texture and the equivalent 'stone' texture.
This may be the problem.

I have the same issue and don't use any shaders at all.

The Dense Ores mod may be using a custom vertex format, which is not compatible with shaders.
Only BLOCK and ITEM formats can be used with shaders.

This bug is with ANY shaders. Including the "Internal" shaders with Optifine.

I have the same issue, it has nothing to do with shaders (because i turned them off).
It is related to optifine!