Far as I know underground5a is a vanilla biome, and I cannot fathom why it would cause issues even with all the mods I have. Then again, I can't make much sense out of the logs at any rate. If anyone here were inclined to have a look, I've included a full log of a session where all I do is start the game, immediately attempt to beam down onto the offending planet (unsuccessfully), and quit. https://pastebin.com/43CcJjqX
