Strange "strobe" effect when doing slow motion

hi
after using fcp for a year now, i strangly encountered a problem in a video i need to deliver in 2 days.
whenever i did a 50% slow motion i get a strange "strobe" effect. when the frame is more or less static then you wont be able to see it but when the camera pans or the object in the frame moves it is very disturbing.
this is only noticable when viewed on a tv set, not on my display.
i thought it was in the encoding so i did the whole "export using QT" again, this time making sure its 2 pass VBR 6.8 to 8 mbps. still there.
i am working on a Pal system without a monitor so i burned the video onto a dvd using dvdsp (as usual) and then played it in a pal dvd player and tv but this strobe thing is still there.
b.t.w the interlace option on the "export using QT" was set as auto, the same as always.
i didnt do anything different this time but still i get that problem. what could it be ? all the settings in fcp settings are set to 100% quality and the video is fully rendered.
i appriciate your comments and help.
thanx
nir evron

hi jim and thanx for the quick reply...
i used to do my slo-mo in fcp without any problems till today.
b.t.w - im editing DV PAL.
i dont have motion so i'm stuck to fcp.
any suggestions ?
thanx
nir

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