Re: dropped frames in Vegas, fine in Media Player

The first thing to do is to make sure your project properties match your source footage.
To do this, open up the Properties window (File - Properties), click on the "Match Media Settings" icon (looks like a folder), browse to to folder that has camera footage in it, click any one of the clips and click "Open".
Pay attention to the audio properties of the footage as this isn't done automatically.
Your video properties will now match your source footage.
If you need to, switch to the audio tab and make any necessary changes.
This can be saved as a preset for future use.

Please let us know if this helps or not.