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Please check the sticky: https://forum.feed-the-beast.com/threads/issues-with-nvidia-drivers-378-49-preventing-minecraft-loading.214966/ yes, this does apply to you since the hotfix is not yet in the release branch and needs to be manually applied.
In your config folder, open forge.cfg with a text editor and set B:removeErroringTileEntities = true. This should remove the block causing your world to crash.
Old pack list: http://modlister.com/user/Quetzi/FTB%20Beyond I haven't loaded up the instance in a while but, for the most part, that list is reasonable accurate. There will have been some minor changes here and there. No Mekanism.
If nothing else I can confirm the account and email are linked. What I will say on the subject of getting onto spam lists: it usually happens when a site you are registered on gets compromised. At least all the spam I get is on emails linked to compromised sites.