Video, but no audio from recorded TV

[AmenRa]

TV-Server Version: TVE3 18550
MediaPortal Version: 0.2.3.0 18550
MediaPortal Skin: Two-Blue Wide
Windows Version: Vista Ultimate x64
CPU Type: AMD 6000 X2
HDD: Segate 500GB
Memory: 4GB DDR2 800 mhz
Motherboard: Gigabyte GA-MA69GM-S2H
Motherboard Chipset: AMD 690G
Motherboard Bios:
Video Card: ATI Radeon X1250
Video Card Driver: ATI 8.390
Sound Card: RealTek
Sound Card AC3:
Sound Card Driver: 6.0.1.5413
1. TV Card: Hauppauge 1800
1. TV Card Type: ATSC
1. TV Card Driver: 3.6
HTPC Case: NMEDIA HTPC 100BA
Cooling:
Power Supply: 300W
Remote: Microsoft MCE
TV: VIZO 48
TV - HTPC Connection: DVI

I recently upgraded my MP and TVE to SVN 18550 from SVN 16599 (a week or so ago). I have a lot of kids shows recorded for my daughter.

I went to play a show that I recorded with TVE PRIOR to the upgrade and all I get is video - no audio. However, this is not true with all of my previous recordings. I would say half of the recordings work and the other half don't work (audio wise, video is fine). MP/TVE will play/stream the video with no problems. I did notice that it's same recordings that either work and don't work. It's not a random event. All the recordings worked PRIOR to the upgrade.

Is there something I need to do to get the AUDIO working with these recordings?