I've been combing through to find the answer to this, so sorry if this has already been answered!!

For existing Octane 3 license owners (non subscribers), if we do the free upgrade to V4, will our V3 license still function as normal, or will the V4 license somehow replace this? We would like to ...

Maybe try changing the border mode in imagetexture (within displacement)?

Oh and in case you were talking about selecting the Tag itself and scaling there, I can't do that because I'm overlaying UV based color onto the grass.

I've tried scaling the UV in the material as well and seems to have the same result. Here's a sample scene if you wanna check it out.

I've run into an odd problem while doing some displacement based grass. I'm feeding a 4k noise image into the displacement channel. When I scale down the noise too much within the image, I get some really strange artifacts/ patterns in my renders. As far as I can tell, there are 2 different problems ...

Def feel your pain! Not sure what type of UI you're doing, but Cinema has some decent spline animation/type tools as well, so another option is to just build a lot of your UI directly in Cinema which would be less back and forth. More complex layers could still be out of Ai or Ae. Setup might be ...

I'd be curious about this as well. I haven't had any luck finding a clean way to do it. One alternative is to actually render out your graphic elements and bring them onto planes in your 3d scene so that your C4D render contains everything. Not efficient but avoids any tracking/matching issues.

Has there been any progress on fixing this bug?

Wondering about this as well...

In the meantime I saw Whirligig for PC has a custom viewing mode for Octane Cubemap, I haven't gotten a chance to test it out though.