Yeah same thing on my ds-x, I did discover last night if I change my mixbuffer size, or disable sound mixing it works but then either worse clicking sound or no sound :(
How does it work for Kasimir2007 on the m3 simply though very strange, and not for you.
different revisions? different dldi driver version?
Not sure if the max limit you are seeing for number disks though, there is no code limit so either you have so many files on your card that its running out of memory reading all the names in lol, or some kind of corruption on your card?, I haven't tried more then 20 d64 files.
Troy(GPF)