The green line at the bottom of the pictured problem has reappeared in GoPro Studio Premium. I have been doing some testing using various recent versions. I have found the problem did not occure in 1.1.1.96 but did appear in 1.1.2.100 onwards including the latest 1.2.0.127. I have also determined this is an encoding problem.

The video was sourced from Sony TD10 as a MVC 3D video. Encoded as 1080i50.

Actually 1.1.1.96 does have the problem but it is much fainter. Tried some Hero 2D footage and that also has a line at the bottom but is more difficult to see. In Studio you can use full zoom and use the vertical control to see the bottom of the picture. I think this bug has been around for ages just not noticed in 2D.

Please report to support as the is no reported bug on this.

I have contacted support and they have reproduced the problem and filed it as a bug. fogbugz 3803.