That looks more reasonable for a 1/3...I think it's just taking it a minute to adjust the exposure...If you try it back to 1/1 and let it sit for 1 to 2 minutes, it will probably go even lighter than this
Sad part is this only works when there's no motion. If a person walked through the screen, they'd just show up as a long streak. How awesome it would be if that brightness and clarity could be achieved at faster shutter using aperture and ISO/Gain.
None of those work, I also notice in BI when sending 15fps in the general box I get the yellow circle but if I send a higher one it's not there, not sure if it's telling me it's angry or not.