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hi, that's very unfortunate as it simply fails to reproduce here, at least on a local built ardour8.6 (the very same to yours but previous versions as well).

here some questions, from the top of my head:

1. what is your base system linux distro?

2. were both ardour8 and drumkv1-lv2 built and installed from source or are pre-built packages for your specific system (1.)?

3. where do the original sample files reside in the file-system? are you by any chance picking them up from beneath some existing ardour session folder? if yes to the later, please don't, ever! that is probably the root cause of your mistakes.

4. do you see any suspicious output/error messages on the console (or log), specially if you launch ardour8 from the command line terminal ?

5. do any others ardour users have or noticed the same problem, on the ardour.org forum?

regards.

UPDATE: Been investigating on this particular issue on several systems and versions, and hold and behold, I think the dang culprit has been found! it is not drumkv1, or samplv1 whatsoever, nor is ardour to blame, at least directly; I now believe the issue is most probably due to libLILV >= v0.24.22 :( here on openSUSE TW. it's still running on v0.24.20 and, as said, everything works as it should! then tried on UbuntuStudio 24.04, which has liblilv-0 = 0.24.22 and ardour failed miserably exactly as you both report: all samples vanishing on drumkv1.lv2 and probably (samplv1.lv2 as bad); on UbuntuStudio 22.04 with liblilv-0 = 0.24.16 iirc, all is well too.