Print to DVD greyed out in 4.51c

[Stereodesign]

Just updated 4.23 to v4.51c and everyting was fine, TM Pro, Quick Titler import via 1394, old projects opening, all working without issue, until I tried the new DVD from timeline only to find the option greyed out, I have a blank disc in the drive ready and am doing everyting the manuals say but it just remains greyed out.
Anyone else had this and found a solution?

[antonsvideo]

is your project setting a standard definition DVD compliant setting?

[Stereodesign]

Threse are what I see in the Project output settings.
I don't know what the Additional Info : HDV bit means as the video was SD DV.

Video
Frame size : 720 x 576
Frame rate : 50.00( 50/1 )
Pixel aspect : 1.4222
Field order : Progressive
Audio
Rate : 48000Hz
Sample size : 16 Bit
Channel : 2
Additional Info : HDV

[antonsvideo]

change your project setting to something interlaced like 50i bottom field, then it should work

all non DVD compliant presets will appear grayed out

[Stereodesign]

Even though I have a NX card installed I cannot get any output settings except with the OHCI SD PAL.

I'm doing this via Settings > Project Settings > Change Current Settings

[antonsvideo]

maybe your source files/project is not suitable to be changed to interlaced on the fly?

what was the original footage and project setting at the capture stage?

[Stereodesign]

Capture settings. SD mini DV

Video
Frame size : 720 x 576
Frame rate : 25.00( 25/1 )
Pixel aspect : 1.4222
Field order : Progressive
Audio
Rate : 48000Hz
Sample size : 16 Bit
Channel : 2
Setup
Rendering format : Canopus HQ AVI
TC preset : 00:00:00:00
Total length : --:--:--:--
Over Scan Size : 3 %
Audio Reference Level : -20.0 dB
Track
V tracks : 1
VA tracks : 1
T tracks : 1
A tracks : 4

[antonsvideo]

progressive maybe the culprit?

frame rate should be 50i

[Stereodesign]

indeed it was, opened a new project with Botton field First in the settings and Print to DVD is now available.
Many thanx.