What does the "Enable Glow Effect" checkbox do?

Solution 1:

There are 3 glow effects in the game.

  1. As a demoman, any stickybombs you place glow.
  2. In Payload maps, the bomb cart glows.
  3. In CTF maps, the intelligence briefcases glow.

Glows are visible through walls.

I assume that enabling this (it's disabled by default) will show any glows you would normally see.

It's not useful most of the time, unless you were recording a replay of a demoman life.