A strange case. Tough to troubleshoot if it cannot be replicated. Your project was just now reloaded into version 8.42 and it played fine, as always. Other than a rather lengthy caching and export time, possibly slowed by numerous MOV format files, there appears to be nothing odd.
Though this is mainly an audio issue that besets later VP versions on your PC, considering updating the video driver and Direct-X, if needed.
Update DirectX: http://support.microsoft.com/kb/179113 AMD / ATI users: http:/support.amd.com/us/gpudowload/Pages/index.aspx
Here is that project. Download it. Unzip if necessary, Open the resulting folder and run the VPJ to load it into Videopad. Does it play?
Here is a very low-res export, just to confirm that all content was available.
A shame that you cannot test this on another machine, using 8.42.
https://www.nch.com.au/general/refund.html