Hi, yeah maybe. What's strange is that my sister has three or four worlds (we use the same account/computer) and the game crashes on her occasionally (especially if she uses cheats) but this never happened to her. The waypoints are part of Zan's minimap, which is pretty standard, I know a lot of people use it. I don't know about the texture pack, my sister downloaded it because Joey Graceffa uses it lol. But you could be right.
I didn't notice any changes the first time it was gone, it spawn in a random place but everything looked the same, but yeah... I guess something could have been damaged from it :(
You are right, I'll have to mourn my world and start over. I had just spent 5 hours building the coolest room for my enchantment table/brewing station *tears up*
thanks for the reply <3