It looks like the waveforms on the clip you have highlighted are flat, which would explain why there is no audio output. Check the file and make sure it plays back ok outside of Vegas.
Former user
wrote on 9/22/2017, 10:54 AM
This problem only occurs in Vegas 15. Versions 13 and 14 are ok. The Photo of the audio is of an audio rendered in the .wav format of a project configured for 5.1 Channels. I always pull the rendered audio to timeline to see if it's ok. Unfortunately in Vegas 15 this bug occurs that did not exist in previous versions of the program. Vegas 15 no longer supports ac3 Pro stereo and ac3 Pro 5.1 Channels. So I was testing rendering in wav 5.1 Cahnnels But even this is difficult in Vegas 15.
Thank you for the explanation Set. Is there any possibility of AC3 Pro Stereo and AC3 Pro 5.1 being put back in Vegas? They are very important to our daily work.