Dropped frames on the timeline... why ??

Hi everybody,
This is my first post here... i'm French, so please excuse my english
I have a little but very annoying problem on Final Cut Pro 7.
I work with a Canon HV40, HDV 1080 25p.
The FCP project is set on HDV 1080 25p.
When i play the imported footage from the browser in the viewer : everything's fine.
But then, when i take a clip, put it on the timeline, and read it in the canvas, some frames seem to have disappeared. Like 1 or 2 times per second (i haven't really counted), one frame is missing. I have no error message for that, as if it was perfectly normal...
I read like half the internet to find out about this problem, but no answer seemed good enough for me.
Some clues to solve the puzzle :
1/ every other program was shut down.
2/ the very same frames are missing, every time i play the timeline. So i guess it doesn't seem to be random.
3/ When i use the left and right arrow keys to play the timeline "frame by frame", i can see that the frames are really missing. My conclusion is that it's not a problem of power, or ram or whatever. The frames really seem to have disappeared. When i export the project, the frames are missing in the created film too.
4/ Again, playing clips in the browser is absolutely fine. No dropped frames. The problems appear when the clip is on the timeline. Maybe the timeline has properties that i haven't coreectly configured ?
5/ This is the very first time i use FCP... this means the solution can be very simple (I used to work with Pinnacle Liquid Edition, on PC)
If anyone has an idea...
Thank you very much for your help.

Here are some new elements !
I decided to hunt every missing frame, and the answer is : one missing frame every 25 frames. Which means 24 frames are normal, 1 is erased, 24 normal, 1 missing, and so on.
This confirms :
- it's not a random bug
- it's related to the number of frames per second
- I am the one who did something wrong... Final Cut is probably innocent !
I zoomed on the time line. The timecode goes :
00:00:00:00
00:00:00:01
00:00:00:02
00:00:00:22
00:00:00:23
00:00:01:00
This would mean 24 frames per second ?!
I thought i had set everything i could on HDV 1080p25 or 25 fps everytime FCP asked... turns out i was wrong.
When I click "Sequence", "Settings", i can see Quick Time Compressor is set at "HDV 1080p25", but Timebase says 23,98.
I guess it could be the problem... do i have to change the Timebase ? How do i do that ?
Thanks again for your help.

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Dropped frames on the timeline... why ??

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