When you place an inverted sky block on the ground and look down in the direction of it your whole screen turns blue, this is probably also the case with an redstone activated skyblock.

Having a similar issue. Using OpenBlocks-1.7.10-1.3-snapshot-432. Including a screen of what I see when I'm looking in the area of the block. Can't find it to break it either.

yep, had exactly the same as m1zark

This may be interaction with other mod. What other, well, ''fancy'' blocks are nearby? Is there an angle where this doesn't happen? Or it's just plain flatworld and just vanilla blocks?

Looks like some Intel GPUs have problems with some operations used for skyblock rendering. I need more info to determine if this is cause here.

What cards do you use? Do you have up-to-date driver? Also, again, can you reproduce it with only OB and flatworld?

I Have FXF HD7770 up to date drivers and I could reproduce this when the topic was active not seem to be able now

Forge has forcefully disabled underlying mechanism in 10.13.2.1230. On affected versions blocks are rendering as solid cubes in single color.

Can't reproduce in empty world and with OB only.

Also, please specify exact version.

Probably no longer applies, since rendering code has changed. Please create new one if problem still persists.