I'm trying to render a video of 1 hour.
In the AE project everything works & sounds perfect.
The problem appears after rendering, when no sound can be heard in the first 10 mins of the video.
I'm using AE 2014 & Media Encoder 2014 as well. Tried rendering with the 2015 versions, same problem.
Would really appreciate some help here
Try rendering an intermediate file (such as QuickTime with the PNG codec) out of AE's render queue. Then drop that resulting file into Adobe Media Encoder to make your deliverable (H.264 or whatever it is). See if that helps.
Thanks Szalam for your comment but in this case I'm having even bigger audio issues.
I tried rendering at my friend's computer, but had the same results unfortunately.
If anyone thinks he might know what the problem is, I would love to have your help.