can't capture 25p into DNxIO

Hi,

I'm trying to capture 1080 25p into DNxIO without success. I'm coming from HDCAM tape and checked the exact same signal path into an Avid Nitris which captures this tape fine.

I'm using the first SDI port on the bottom row of the DNxIO and my Hardware Tool says it's 1080i which it is not. If i switch the project to 1080i it will capture but the source is 1080 25p and when i try to capture in the 25p project i get the "no vaild signal...." message and the video button clicks off.

When I click the video capture button on the little green video lock light goes off. It seems that the unit will only see the source as 1080i and i can't find any way to change this.

Any thoughts gratefully received, I'm stumped.