Alright, so the long and the short of it is that I'm running the second most recent version of TC because when I use the latest, it simply doesn't show up in my game. I'm running singleplayer with Forge.

Here's my crash report.

From the stacktrace, it looks like the conflict is with Project Red, though I'm not entirely sure because Java is not my forte. If it is the problem, I have absolutely no idea how to fix it or what to fix. I have PopulationBoundsCheck set to false and it isn't helping. I haven't edited anything except that, structure generation, and decreasing the frequency of ice biomes. I made sure to delete the region folder from my save file between generating the world and editing it. It'll run for a few seconds before crashing when I load it.

Thanks!

In 2.6.3 PopulationBoundsCheck was expanded to also ignore mods placing blocks outside the 2x2 population chunk area, not only BO3s/BO2s. Setting it to false won't help in 2.6.1.

Maybe the latest dev build works?

Finally got around to trying it, and it works perfectly. Thanks loads!