In last night's games, questions regarding LOF for colossals came up and we referred to the LOF table at the back of the rulebook. We noticed, however, that it only goes up to giants.

Was I correct in assuming to treat LOF to/from colossals as you do for giants?

on page 13 of the 2010 Rulebook:
but in the FF PAC:
I'm interpreting the above as not even blocking terrain nor elevated terrain blocks LOF to and from colossals. Is that correct?

That is quasi-incorrect and has been updated. Colossal now reads:

It has been explained that the line you quoted from the FF PAC was always intended to refer to characters and never terrain, and so has been changed to reflect that.

Blocking terrain is always blocking terrain.

When drawing LoF from an elevated to a colossal, you treat them both as if they were elevated, and so the doesn't have to be "on the rim."

ahhhh.... the player's guide... now why did I not check the PG?
Thanks!

"Hindering terrain and other characters do not affect the line of fire, except for the square the target occupies."

In Regards to this sentence; When a Colossal is going a make ranged attack targeting a character with stealth (with several blocks of hindering terrain between them), if the targeted character isn't occupying a square of hindering then the line of fire is not blocked?

If the colossal is elevated, sure.

But if the colossal is not elevated, it would draw LOF like any other grounded character and the hindering terrain would interfere with LOF.

so, do you treat colossals as giants when you use the LOF table on the back of the rulebook?

Other than the fact that colossals will ignore giants in the way, yes.

and that's how we played it last night... good to know... thanks!