World Corruption 1.7.10

Hi guys,

Hoping someone can help me resolve an issue i've been having when playing on a modded single player with Forge (Via Twitch Client, if that helps).

The issue is simply - Whenever i log out of a world after playing, the world is completely corrupt - according to Minecraft. (See below)

The only time this seems to happen - is when i have both Forge Essentials and Multiworld installed and enabled (since that's what i've been trying to test to have multiple worlds), if i disable them both, i have no issues (that's with the other 70 or so mods installed).

Can't say i've seen an issue like this before - but i can't seem to resolve it, nor would know where to start.

If anyone has any brilliant ideas - that'd be much appriciated.

If you need any other info, please let me know.

Thanks.

Mac