(This may be a Kontakt question, so I've posted in the Native Instruments forum as well, but in case there's a Logic aspect to it as well I'm posting it here. The error message screenshots I attached are from Logic, not Kontakt, and this issue only happened after updating to Logic 10.6.3 about a week ago, but that could be a coincidence. It's a bit long and possibly confusing, sorry.)
I'm working with a co-composer on a project, and we send Logic sequences back and forth, with lots of Kontakt instances within. He has some Kontakt instruments that I don't (some are custom samples he can't share, some are expensive libraries, the Spitfire winds and brass, that aren't used often enough for me to justify purchasing.)
ISSUE #1: If he sends me a Logic session that uses some of his custom Kontakt instruments, they don't load on my computer, which is obviously expected. But when I transfer the session back to him, the instruments appear to load into Kontakt for him (the Kontakt instance isn't "empty" when you open it, the instruments are "there") but they don't actually play/make sound. He has to reload or replace the instruments in those Kontakt instances, then they work just fine. This issue happens with Kontakt 5.8.1, and these custom sample aren't actual Kontakt "libraries," they are just loaded through "files" menu in Kontakt.
ISSUE #2: If he sends me a a Logic session using the Spitfire winds/brass that I don't have, those instruments don't load for me, again obviously. When I transfer those sessions back to him, the Kontakt instances that held his Spitfire instruments DO appear "empty," the instruments don't even appear to be there, compared to Issue #1. This happens with Kontakt 6 Full (my computer) and Kontakt 6 Player (his computer).
RELATED: we both have Spitfire Chamber and Symphonic strings, and those transfer just fine between our computers. In fact, for every single one of the instruments we BOTH have, we have no problems, Logic/Kontakt automatically loads those instruments on either of our computers no matter how much we transfer projects back and forth. This issue only happens when he uses and instrument I don't have, I work on the session on my computer, and then transfer it back to him; that's when those instruments don't load properly.
We both have Logic 10.6.3, MacOS Catalina. I attached screenshots of error messages we have gotten. Apologies but I can't remember right now which issue each of the screenshots correspond to. I hope I explained this properly. Thanks so much in advance for any help you may have, this issue is slowing us down a lot!