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I have a project that's 1280X720 @25

I do have clips in the project that are various resolutions, but this hasnt seem to be a problem.

I render as the "Match the Project Settings" and everytime the video plays back much slower.

How to fix?! Also sometimes my project becomes off time. But if I restart Vegas it fixes itself.

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How much slower is much slower? What do you mean by your project becoming off time? – AJ Henderson Jun 16 '14 at 19:15
Do you mean the video renders slower than the preview in the editor or do you mean the final rendered video plays back more slowly than the preview in the editor? – Professor Sparkles Jun 16 '14 at 23:18
What and how did you set the "project properties" ? – filzilla Jun 18 '14 at 23:46

This was resolved due to incorrect audio sample rate with my DAW. In Vegas I was editing in 24 bit 48,000Hz. After render, my systems was attempting to playback the video file at 16bit 41,000Hz which will cause this effect.

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