/* The UIImageView responds to touches with this init: */
_maxAltitudeSlider = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"defaultImg.png"] highlightedImage:[UIImage imageNamed:@"defaultImg.png"]];


/* Same file, renamed in Photoshop -- UIImageView ceases responding to touches: */
_maxAltitudeSlider = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"upper_alt_handle.png"] highlightedImage:[UIImage imageNamed:@"upper_alt_handle.png"]];