Thanks a lot for your reply.
Well, just tried a better 32GB Class 10 card but still no dice. Put both cards in Colorfly C4 and they were giving me "Play Error" as well.
No issues with Redbook stuff (44.1/16 *.WAV files) stored on the same cards whatsoever. Even tested 96/24 in addition to 96/16 but still not making a difference.
Really not much could be posted for further troubleshooting except for log files like this:
eac3to v3.27
command line: eac3to.exe "..\FINAL FANTASY ORCHESTRAL ALBUM\00019.m2ts" 2: 20.wav -down16
------------------------------------------------------------------------------
M2TS, 1 video track, 1 audio track, 1 subtitle track, 0:04:41, 60i /1.001
1: h264/AVC, 1080i60 /1.001 (16:9)
2: RAW/PCM, 2.0 channels, 24 bits, 96kHz
3: Subtitle (PGS)
[a02] Extracting audio track number 2...
[a02] Reading RAW/PCM...
[a02] Swapping endian...
[a02] Reducing depth from 24 to 16 bits...
[a02] Writing WAV...
[a02] Creating file "20.wav"...
[a02] The original audio track has a constant bit depth of 24 bits.
[a02] The processed audio track has a constant bit depth of 16 bits.
Video track 1 contains 8411 frames.
eac3to processing took 11 seconds.
Done.