1) Stealth: If an attacking character is making a Close Combat Attack on a character in stealth, does the stealth character still get the +1 Defense modifier?

2) Can you even attack a character in stealth if you are adjacent, or is line of fire still impeded?

3) If you use Incapacitate to place a second token on a character, does that character take pushing damage?

Sorry for my ignorance.

1) The +1 defense modifier you speak of, that only applies to ranged combat attacks, so there is no bonus for close combat attacks against characters in hindering terrain.

2) Line of fire is still blocked, but you don't require line of fire to make close combat attacks, just adjacency.

3) Yes they do, unless they have some way to ignore pushing damage such as Willpower, the Indomitable defense symbol, Power Cosmic / Quintessence TA, or some other way to ignore pushing damage.

1) No. The hindering terrain modifier is only for ranged combat.

2) LoF is only for anything that requires range, not for close combat.

3) Yes, as long as they don't have a way to avoid the push Damage like Power Cosmic/Quintessence TA's, Willpower and Indomitable (Indomitable allows the character to use Willpower), or some other Special Power or Trait that allows them to avoid pushing Damage (such as E-2 Superman, or the Wolrd's Finest figure).