m4a problem

Dear Oresztesz,

Would you be able to supply us the XML you used and the m4a media in question so that we can investigate ? I have raised a ticket here and will pop you details of where to upload the media if you can.

Many thanks.

Ive just bought XtoPro, and on my first job with it, I had to deliver AAF for a commercial.
Ive checked the AAF in Logic Pro, since I dont have access to ProTools at my place.
The rough voiceover was done by me on my iphone.
I have used the m4a created by the phone in the edit.
Now the worst thing that can happen with an application like XtoPro is, if everything looks to be OK, but in fact is off by a couple of frames or seconds.
One of the voiceover files (so an m4a) was off by approx. a second, everything else seemed to be fine.
So Ive converted it to wav, relinked it, reexported the xml, did the aaf, and then it was OK.
This m4a was just edited in its place, it had no effects, no fades, nothing...

I usually work with rough iPhone voiceovers (sometimes from directors or agencies), and I dont really enjoy having to convert something, that works fine in FCP.
Can you trust XtoPro to work well usually, or are these sort of problems rather common?

Did anyone else encounter this problem?