[Is this a mod issue or is this vanilla?]

What mods are you using?

And what are your launcher settings?

[potatomine]

Its not that hard, depending what you want.

You could just make a potato and add a rune spell to it with no textures. Or scrypt the whole thing into a spell that drops a potato at the location and the invisible rune.

Easyer sead than done :D

[Fireball Spell Problem/Bug]

Are you using any mods that might affect fire or casting spells?

[Grass loading issues]

Try uninstalling Grass on Steroids and reinstalling it.

[Can't edit preferences]

Are you an adult?

[cant log in nexus]

Uninstall, re-download, install, open. Should work then.

Maybe your firewall is blocking it.