Sure looks like a bug. I downloaded bug.tgd and recorded the render camera positions and the Alpine seed number (4352.) Then restarted TG2 and added the Alpine fractal and seed at 4352. Inserted the render camera positions and there it was. This was using the x64 version. Same thing happens with the x32 version.
Here are the render camera positions:
(Position) xyz: 11416.2, 1191.17, -7103.16
(Rotation) xyz: -24.8167, 112.787, 0