MarketPress Store Pages Not Found

Hi,

"STAFF ACCESS GRANTED"

I have the same problem here
https://premium.wpmudev.org/forums/topic/404-redirected-and-marketpress

When I first installed MP version 3.1.1, all pages were OK.
To get the affiliate plugin compatible, I downgraded to MP 2.9.x. But the variation download options are worse. So, I upgraded it to the current 3.1.1., then this problem occurs.

These subpages are OK
/store/products/product-name

These store pages are not OK
/store/products,
/store/shopping-cart
/store/order-status

Please help.

Best regards,
Vi