Hello,
I'm playing WoW Classic Anniversary 1.15. I just downloaded the latest version 11.1.8 of TrinketMenu and after a disconnect/reconnect. The black outline that AddonSkins provides is gone. You have to reboot the game completely to get the texture again. When I /reload, it also removes the texture, the black outline. It's a bit annoying when you're a perfectionist like me ! xD

A screenshot below :

TrinketMenu with AddonSkins on my first login :

TrinketMenu after a /reload or a reconnect :

Thanks, i hope u can find the problem !

This is also a problem for me, the menu does not keep the skin after initial load.