What about the autoresolution, is it on? Also check the mediainfo of files which have a problem with multi. Frankly i don't see a reason to use multi and autoresolution, it brings more problems than a favour.
Sorry for waiting. If you have the file with DTS-HD audio, please upload it on ftp (without login and pass) ftp://93.189.40.122/Share/Test/Mediaplayer/test/ and i will check it.
Use this link http://ns1upd.dyyndns.info/ipk/ddns_0.3_mipsel.ipk for manual ipk installation from /tmp you can find it in /etc/ddns.conf.dist (i guess that you can rename it like ddns.conf or fix the name in sh4) with next fields HST="" PASS="" UPD="" Also you can find the /usr/bin/ddns.sh