I don't know how this hasn't been brought up yet, but the addon won't remind you to use your level 70 Master soulstone. The lvl 60 Major soulstone works fine. I only noticed it when I dinged 70 a few days ago.

I found where the issue is in Allbuffs.lua lines 335-348 The spellid 22116 is missing from both of these:
BOM.ItemList = {
--{6948}, -- Hearthstone | Ruhestein
--{4604}, -- Forest Mushroom | Waldpilz
--{8079},-- Water | wasser
{ 5232, 16892, 16893, 16895, -- Soulstone | Seelenstein
16896 }, -- TBC: Major Soulstone
}
BOM.ItemListSpell = {
[8079] = 432, -- Water | Wasser
[5232] = 20762,
[16892] = 20762,
[16893] = 20762,
[16895] = 20762,
[16896] = 20762, -- Soulstone | Seelenstein

Should look like this:
BOM.ItemList = {
--{6948}, -- Hearthstone | Ruhestein
--{4604}, -- Forest Mushroom | Waldpilz
--{8079},-- Water | wasser
{ 5232, 16892, 16893, 16895, -- Soulstone | Seelenstein
16896, 22116 }, -- TBC: Major Soulstone
}
BOM.ItemListSpell = {
[8079] = 432, -- Water | Wasser
[5232] = 20762,
[16892] = 20762,
[16893] = 20762,
[16895] = 20762,
[16896] = 20762, -- Soulstone | Seelenstein
[22116] = 20762,
}