Hi benjamin
We don't know that plugin, and it's weird that Product Levels can be blocking such functionality. Mainly because none of our plugins are loaded on the user edit page?
Do you mean that if you disable Product Levels, it loads, and if you enable it, it does not load?
Anyway, I have to say that we don't offer support for 3rd-party plugin conflicts. If you have found a conflict here, you can try to ask the b2bking support or try to find an alternative. I'm sorry.
Best Regards,
Salva.