Premiere is making corrupted H264 Mp4 files,  why?

I am exporting a series of [nested] sequences as H264 NTSC Mp4s.
If I export one sequence then it works fine and I can play it in Quicktime etc.
If I export this nested sequence of five timelines, then it produces a corrupted file that no program can use.  It complains that the file is unsupported or corrupt.
I have noticed at the end , Premiere is stuck on 99.9% progress for 18 minutes.  So I don't think it's finishing the file off properly.
Any ideas?

Mr Bansaw, did you sort out your MP4 export problem? I have a single non-nested 10 minute sequence. Using a slightly modified AME HDTV 1080p 25 HQ preset to export to H.264 mp4 as follows:
PAL, 1920x1080, 25fps, progressive, VBR, 1 pass, Target 10Mbps, Max 25Mbps, AAC 160kbps, 48kHz. (I dropped the target bitrate from 35Mbps in the preset thinking that might be the problem, but it didn't make a difference).
The export seems to go fine ie without errors, but playing back the exported mp4 gives the occasional but noticeable stutter using VLC or WMP (ugh).
I will be projecting the video on a large screen so need the best quality.
I am using PPro 5.0.3 on an Intel i7 920, 12GB RAM, 4 x 1TB 7200 HDD, ATI Radeo 4870 1GB, Windows 7 Ultimate SP1.
Any suggestions will be welcome.

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    Hello all
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