All these things being the case, I'm not sure, then, why you're having this issue. As I said, I've had it in the previous couple versions of OSX but it was due to me trying to import stuff I'd shot ar 60p.
I do, however have a question regarding the resolution of your clips. You're shooting on a Sony HDR-XR260. Looking through the manual, I don't see a setting there for 1440x1080 at 25 fps. Actually, I was looking yesterday for a setting for 29.97 since that's what most video is nowadays anyhow & my stuff is just for YouTube upload.
From the manual:
[60p Quality  ]: 1920 1080/60p quality, AVC HD 28M (PS)
[Highest Quality  ]: 1920 1080/60i or 1920 1080/24p*1 quality, AVC HD 24M (FX)
[High Quality  ]: 1920 1080/60i or 1920 1080/24p*1 quality, AVC HD 17M (FH)
[Standard  ]: 1440 1080/60i quality, AVC HD 9M (HQ)*2
[Long Time ]: 1440 1080/60i quality, AVC HD 5M (LP)
I see the 24p under the highest and high quality settings, but they're denoted with the *1 which only applies to the HDR-CX580V/PJ580/PJ580V/PJ600/PJ600V models.
I'm very new to video stuff and as such am pretty green with a lot of it. Any help with the cam would be much appreciated. I'll keep digging to see what I can find. Meanwhile, what are the exact cam settings you're using, i'll shoot some stuff with those settings and see what happens on my system.