I started running into a similar issue right around the time of your post. I've used FCP for a very long time, and have been using the NX5 for 3 years. Never had any problems once FCP 7.0.3 came out. But about a year and a half ago, I started noticing long clips would crash FCP 7 seconds before the end of the upload. For me, it wasn't 45 minutes but about 74 minutes seemed to be the max length. I could swear I had earlier projects with longer clips and no problem but couldn't track any down. I just uploaded a 74 minute clip no problem, but a 93 minute clip crashed.
My work-around has been to break the clip into clips shorter than 70 minutes. I overlap the time code by about 1 second and then put it all together on the timeline.
I started looking at the forum today because in the last few days I recorded two separate projects each with multiple long rolls of either music performances or speeches. Most are about 90 minutes, two as long as 180 minutes. It's a hassle breaking these clips into shorter pieces so today I started reviewing the forum to see if anyone else has run into this.
There doesn't seem to be a lot posting about it, and the the ones that do post seem to have different "crash" times ... yours being 45 minutes, for example.
Is this really a restriction with Sony AVCHD files? I tried a few third-party solutions but they seemed cumbersome. When FCP 7 Load & Transfer works, it works great. It's just these 74+ minute clips that are the problem.
I just doubleclicked on a 123 minute clip in the AVCHD Package in the Finder, and it opened fine in QuickTime Player X. I can export it out of there. The "Movie" export did it very quickly ... less than 20 minutes ... but it ends up as an H.264 file so I would need to render in FCP 7. But it does give me one cohesive clip.
What other experiences have users had trying to Load & Transfer long Sony AVCHD clips into FCP 7?
I'll probably post this as a new question to start a new thread.
Thanks in advance for any suggestions or advice.