On EGP Emitter, When you set the angle of the text, it disappears.
Code example:
if(first()) {
EGP = entity():isWeldedTo():wirelink()
EGP:egpClear()
EGP:egpText(1, "KaKTyC", vec2(256))
EGP:egpFont(1, "consolas", 20)
EGP:egpAngle(1, 45)
}
Works perfectly fine for me, make sure your Wiremod is up-to-date.

EGP Emitter not EGP Screen...
Oh right, I'm blind.
Apparently duplicate of #776.
Most helpful comment
EGP Emitter not EGP Screen...