Thanks for the reply. What is missing from 10 that is in 12 or 13?

Vegas Pro 11

Vegas Pro 12

Vegas Pro 13

On a lark, I rendered two of Old Smoke's 4K 100 Mbps XAVC test files in Vegas Pro 10 without incident. No plugins, no effects, etc. (The implication is that 1080 XAVC should be easier.)

Source File Specs
Complete name : E:\4K Test Files\4K24p-100Mbps\C0010.MP4
Format : XAVC
Codec ID : XAVC
File size : 148 MiB
Duration : 13s 514ms
Overall bit rate mode : Variable
Overall bit rate : 91.7 Mbps
Encoded date : UTC 2015-03-19 16:50:13
Tagged date : UTC 2015-03-19 16:50:13

Video
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L5.1
Format settings, CABAC : Yes
Format settings, ReFrames : 2 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 13s 514ms
Bit rate mode : Variable
Bit rate : 89.9 Mbps
Maximum bit rate : 100.0 Mbps
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.452
Stream size : 145 MiB (98%)
Encoded date : UTC 2015-03-19 16:50:13
Tagged date : UTC 2015-03-19 16:50:13
Color primaries : BT.709
Transfer characteristics : IEC 61966-2-4
Matrix coefficients : BT.709

Mainconcept Blu-ray Output File Specs:
ID : 1 (0x1)
Complete name : C:\Users\John\Desktop\Mainconcept 1080-24p.m2ts
Format : BDAV
Format/Info : Blu-ray Video
File size : 71.1 MiB
Duration : 22s 474ms
Overall bit rate mode : Variable
Overall bit rate : 26.5 Mbps
Maximum Overall bit rate : 35.5 Mbps

Video
ID : 4113 (0x1011)
Menu ID : 1 (0x1)
Format : MPEG Video
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 : 2
Duration : 22s 522ms
Bit rate mode : Variable
Bit rate : 25.3 Mbps
Maximum bit rate : 30.0 Mbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate : 23.976 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.508
Time code of first frame : 00:00:00:00
Time code source : Group of pictures header
Stream size : 67.8 MiB (95%)

Sony AVC/MVC Blu-ray Output File Specs:
Complete name : C:\Users\John\Desktop\Sony AVC-MVC 21.9 mbps.avc
Format : AVC
Format/Info : Advanced Video Codec
File size : 59.1 MiB
Overall bit rate mode : Variable

Video
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.0
Format settings, CABAC : Yes
Format settings, ReFrames : 2 frames
Format settings, GOP : M=2, N=12
Bit rate mode : Variable
Maximum bit rate : 22.0 Mbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate : 23.976 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive

I rendered for the Internet using a customized Sony AVC/MVC render template. Results are .

Thank you for the test. The fact that you worked with 4K in 10 without any special additions gives me hope. I would only be using 1080 P or I for the project. The project is two short interviews with some B Roll. They want to use the CX 900 and the bonus is I get to keep the camera after the project is done. I just wanted to make sure Vegas 10 Pro would handle the footage. Output will be to flat screens that are 42-60 inch. It may be projected to a 10 foot screen at some time.

It seems I should not have an issue.