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I making a side-scrolling game where i want to detect collision only around the players feet(think streets of rage). I used setspriteshapecircle to set a circle around the feet but doesn't stay in place once i move the character. The tutorial says "You should not use physics or collision commands on sprites fixed to the screen as their debug shapes will not line up and they will interfere with physics sprites not fixed to the screen. " so what should I use?

[//player
seanImage = agk::LoadImage("Cake/cakewalk.png");
seanSprite = agk::CreateSprite(seanImage);
agk::SetSpritePosition(seanSprite, 20.0f, 70.0f);
agk::SetSpriteAnimation(seanSprite, 26, 36, 4);
agk::SetSpriteSize(seanSprite, 15.0f, -1);
agk::SetSpriteVisible(seanSprite, 0);
//agk::SetSpritePhysicsOn ( seanSprite, 2 );
//agk::SetSpriteShape(seanSprite, 3);
agk::FixSpriteToScreen (seanSprite, 1 );
agk::SetSpriteShapeCircle(seanSprite, agk::ScreenToWorldX(agk::GetSpriteX(seanSprite)), agk::ScreenToWorldY( agk::GetSpriteY(seanSprite)) , 30);]

Just don't use the fixToScreen command... this positions the visible sprite at a point relative to the screen and not the "world". Take a look at this tutorial, it explains the difference between the "World" and the "screen":
AGK Bitesize 001