Let me preface this by saying; I love this mod. As an aspiring aviator and vehicle lover, this mod is a perfect addition to my modpack to allow me to travel the worlds in many different awesome ways. Now, to the point, about 80% of the new worlds I create don't load at all, and if they do, only about 10 chunks load. In addition to this, even if they do load, i cant access other dimensions (I.E, the nether, the end, and other planets for galacticraft), and if i do, they dont load any blocks/chunks. theres no crash report, and im not savvy enough to know how to read the code to know where everything goes wrong. I ran my own expreiment where i removed mods one at a time (painstakingly so) and when i reached Davinci's Vessels, the worlds loaded up fine and there were no problems whatsoever. I have a top of the line gaming PC so im pretty sure that it isnt a hardware issue. Again, i love this mod and i would love to redownload this mod, im going to keep trying until it does. I don't know enough to know if you can do anything about this issue, but if you can i figured i would bring it to your attention.