DaemonUmbra

Can we get complete logs for both server and client, and please use pastebin or gist as per these rules:

For anyone to help you you'll need to post logs, please refer to this thread for more information:

I can't say much for Bukkit, but I found this in the Forge Docs: https://mcforge.readthedocs.io/en/latest/networking/simpleimpl/ Edit: Isn't Bukkit entirely serverside anyway? (Rhetorical question)

According to your latest.log you are using LiteLoader and Sponge, this forum is only for Forge/FML. Using sites like Dropbox or mediafire is also discouraged. Please read this thread:

1.7.10 is no longer supported on this forum.

Give it 3 or 4? It's higher than what the docs call for but it might work. Note that throwing ram at things is not always the answer

Check the bottom of this section in the documentation: http://mcforge.readthedocs.io/en/latest/gettingstarted/#from-zero-to-modding

May or may not be relevant, what version of Java do you have as well?

(Deleted)

If you have a world open, holding F3 and C for 10 seconds will crash the game as part of vanilla minecraft's debugging features. As for the launcher re-opening, while it's no longer automatic you can set it to remain open while the game runs by following the steps below.