Weird audio problem in Soundtrack

Ok, first of all, I'm sorry about my english, this is a tricky thing and I'm not sure of making myself clear. If I'm not please tell me and I try to mess it up a little more...
We film short movies without problem until now. We shoot the video (Sony Z1) via components through a BlackMagic Intensity Pro directly to FCP (1920x1080 ProRes HQ). And record the audio to the Edirol R-4. Then we sync with the clap and everything works just fine.
This last time, we did the exactly same thing, but the problem came when I'd finish the edition on FCP and did the "send to: Soundtrack Multitrack project".
Everything looked just fine but when I star to work with the audio, everytime I start or stop the playhead there was this click/pop sound (like the one on old vinyl records), but it's not just there, when I try to use the Ambient Noise tool like I always do, I made the selection of the ambient noise, set noise print, made the selection of the audio that I want get rid of, and then, reduce noise, the weird click/pop noise appears in the IN and OUT of the replaced audio!!
I did relaunch Soundtrack, re-send to, made OMF, XML, restart... everything!! but the noise is still there.
At first I thought of an incompatibility between FCP and SP but then I made some tests...
If I open a new project on Soundtrack and import the audio, still got the noise.
If I open those audios from differents hard drives I always get the noise.
If I open another old project (recorded in the same way) I don't have any noise.
If I import one of these audios to that project, I get the noise only when I'm on those audios!!!
So, the problem is in those audios!!
What's with these the audios??!!!
All the audios I record are recorded in the same way, with the same propierties, they all look the same and sound the same (the sound is good, free of any kind of noise)
wav file, 16 bits, Mono, 48,000 kHz
Anyone?? please!! any ideas??
Thanks!
EDIT: Ok, I'd just reallized this isn't the right forum, it has to be in the Soundtrack Pro forum... can any admin move it, please? Thanks!
Message was edited by: blotch

Do NOT use MP3 files in FCP. Convert the MP3 to match your FCP Sequence settings. Typically that would be AIFF format at 48khz, 16 bit.
-DH

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