Crothian said:
To clear up this confusion could you post a few examples, I'm not sure I'm following what you are saying. Maybe it's the humitidy, maybe it's the hour, but at any rate a few examples would be nice.

Not a problem at all. Here ya' go, but keep in mind, these examples are of the original (x4) method:
Vorpal Longsword: On a critical hit, 2d8 (critical damage) + 4d8 (vorpal damage) + strength mods + misc modifiers (not multiplied).
Vorpal Greatsword: On a critical hit, 4d6 (critical damage) + 8d6 (vorpal damage) + strength mods + misc modifiers (not multiplied).
Vorpal Dagger: On a critical hit, 2d4 (critical damage) + 4d4 (vorpal damage) + strength mods + misc modifiers (not multiplied).
I'll try expressing the vorpal damage in another way. When I say Vorpal does x4 damage, I don't mean x4 of the total damage. What I mean is that Vorpal deals x4 of the original weapon damage. I didn't explain that because I already addressed that in the thread I linked to, but I probably should have anyway. My bad.
So, if Vorpal deals x4 weapon damage, just find your weapon's original damage (shortsword 1d6) and multiply it by four (shortsword 4d6). This is the amount of Vorpal damage you will deal on a critical hit, and it's Force damage to boot.
Here's another way to express it:
Frost: +1d6 (cold damage)
Flaming: +1d6 (fire damage)
Vorpal: +(x4 original weapon damage, in Force damage)
Make sense?