MarketPress product pages 'not found' all of a sudden

After logging in (support access granted) go to
http://naked.MyURL.com/store/products/red-v-neck-t-shirt-regular-female/

You get
'SOMETHING IS NOT RIGHT
TAKE ME HOME'

It's the same problem with ALL product pages.

Go to Store > Products
Confirm that the product pages are there. Open any product page using the 'Edit' link. Then open the permalink.

You will see that the page is 'not found'

This makes no sense to me.

Please:
1) Have a close look at this (access granted)
2) Explain what is going on here and why
3) Please FIX this ASAP, please..asap
4) Tell me what you did to fix this

This was working fine this morning. I updated MarketPress to see if that fixed the problem - no change. I disabled all unnecessary plugins - no change.

I really need your urgent help with this. Thanks in advance