Glad to see it is working for you......
Hmm... I wasn't able to reproduce this issue... Since your texture pack doesn't even touch the player textures, I see no reason why players would turn invisible by using it
Probably it's something else, so it's not related to the texture pack.
Thanks for looking into it...... I couldn't see any way the textures would turn players invisible.
Happy to see sharkbitefischer has it working on the server.