Vegas HD Platinum 10.0 build 179
Quicktime Player 7.6.7

A couple of things, based on the limited information you were able to provide.

-- You are the first to report using QT 7.6.7 with VMS 10 (afaik). It was designed around 7.6.6 and below. Missing MP4 and MOV audio or video is a very common symptom with incompatible versions, as you saw from my previous link.

-- Only Vegas Pro promises XDCAM support, not Vegas Movie Studio.
http://www.sonycreativesoftware.com/moviestudiope/compare

Again, if you will upload a camera sample to MediaFire, others may be able to test it and offer some suggestions.

Media Properties of the QT File

Complete name : E:\PRIVATE\JVC\CQAV\CLIP\445_0001_01.MOV
Format : MPEG-4
Format_Commercial_IfAny : XDCAM EX 35
Format profile : QuickTime
Codec ID : qt
File size : 3.46 GiB
Duration : 13mn 54s
Overall bit rate : 35.6 Mbps
Encoded date : UTC 2010-08-21 23:02:15
Tagged date : UTC 2010-08-21 23:02:15

Video
ID : 1
Format : MPEG Video
Format_Commercial_IfAny : XDCAM EX 35
Format version : Version 2
Format profile : Main@High
Format settings, BVOP : Yes
Format settings, Matrix : Default
Format settings, GOP : M=3, N=12
Codec ID : xdv3
Codec ID/Hint : XDCAM
Duration : 12s 0ms
Bit rate mode : Variable
Bit rate : 35.0 Mbps
Width : 1 416 pixels
Original width : 1 440 pixels
Height : 1 062 pixels
Original height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 25.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Interlaced
Scan order : Top Field First
Bits/(Pixel*Frame) : 0.931
Stream size : 3.30 GiB (96%)
Language : English
Encoded date : UTC 2010-08-21 23:02:15
Tagged date : UTC 2010-08-21 23:02:15

Audio
ID : 2
Format : PCM
Format settings, Endianness : Big
Format settings, Sign : Signed
Codec ID : twos
Duration : 13mn 54s
Bit rate mode : Constant
Bit rate : 1 536 Kbps
Channel(s) : 2 channels
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Stream size : 153 MiB (4%)
Language : English
Encoded date : UTC 2010-08-21 23:02:15
Tagged date : UTC 2010-08-21 23:02:15

Menu
ID : 3
Language : English
Encoded date : UTC 2010-08-21 23:02:15
Tagged date : UTC 2010-08-21 23:02:15
Bit rate mode : CBR

The MP4 file when I try to use it gives an error message 'The file is most likey corrupt or of an unknown format'

the media info for one of these files is

General
Complete name : C:\Users\Owner\Documents\UBC Video\21100814\BPAV\CLPR\445_0003_01\445_0003_01.MP4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42
File size : 2.64 GiB
Duration : 18mn 56s
Overall bit rate : 20.0 Mbps
Encoded date : UTC 2010-08-15 04:39:52
Tagged date : UTC 2010-08-15 04:39:52

Video
ID : 1
Format : MPEG Video
Format version : Version 2
Format profile : Main@High 1440
Format settings, BVOP : Yes
Format settings, Matrix : Default
Format settings, GOP : M=3, N=6
Codec ID : 61
Duration : 10s 1ms
Bit rate mode : Constant
Bit rate : 18.3 Mbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.663
Stream size : 2.42 GiB (92%)
Language : English
Encoded date : UTC 2010-08-15 04:39:52
Tagged date : UTC 2010-08-15 04:39:52

Audio
ID : 2
Format : PCM
Format settings, Endianness : Big
Format settings, Sign : Signed
Codec ID : twos
Duration : 18mn 56s
Bit rate mode : Constant
Bit rate : 1 536 Kbps
Channel(s) : 2 channels
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Stream size : 208 MiB (8%)
Language : English
Encoded date : UTC 2010-08-15 04:39:52
Tagged date : UTC 2010-08-15 04:39:52