Uninstall all previous codecs and packs.
Download Matroska Splitter (Haali Media Splitter) and ffdshow filter from here:
http://x264.nl/ and install them. In ffdshow uncheck MP1, MP2, MP3 and LPCM, and leave remaining options at their default. For S/PDIF choose it later in Audio decoder configuration.
Watch your content with BSP or WMP.
N.B.
Don't use Gabest splitter, because it is old and doesn't support newer MKV files. Haali media splitter, though creates some problems with BSP, but it's a bug in BSP. You can always switch to WMP on problematic files.