I duplicated the problem with my copy of Vegas 11. Upon remuxing the file with FFmpeg, I received this warning about a timestamp glitch:
[mp4 @ 0000000004ca0520] Non-monotonous DTS in output stream 0:0; previous: 1920, current: 1920; changing to 1921. This may result in incorrect timestamps in the output file.The remuxed file (using the same codecs) imports properly into Vegas.
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