Conflict in MarketPress and Protected Content

Hi,
When I enable Protected Content: Settings > General > General Settings > Content Protection (enabled), the membership registration is public but the Store/Product content is OFF.

If I disable the Content Protection: Settings > General > General Settings > Content Protection (disabled), the membership registration is OFF but the Store/Product content is public.

I've found these two similar threads:

https://premium.wpmudev.org/forums/topic/protected-content-is-restricting-access-to-marketpress-product-pages#post-802232

https://premium.wpmudev.org/forums/topic/protected-content-is-blocking-market-press-product-pages#post-772237

But both of them can NOT help.

I changed themes, I deactiviated all other plugins. But it does not work.

STAFF SUPPORT, ACCESS IS GRANTED. Please help.

Vi