updating yourshop all modules disappear

Yesterday I've updated the k2 module and the acymailing component, then all the modules disappeared from the home page although they are selected to be present there (I didn't change anything about the positions).
the result is that if I look at template preview here:
http://www.offertacellulare.com/index.p ... rshop&tp=2
I can see the website as it was and should be.
Instead if I go to home page:
http://www.offertacellulare.com
I see only the menu.

Please help

You've updated only this 3rd party extensions or template also ? Please check Joomla! error log or check template settings (especially active menu) because it looks like your home page redirect to some blank page.

When the problem showed I updated also the template in order to check if there were modifications that could overpass the problem.
I checked now the template settings but everything seems normal, I've tried to associate the template to main menu but nothing changes.
Any idea?

A further detail I'm noticing: if I try to publish the modules on all the pages checking all the boxes for all the menus I still cannot see them in the home page, but if I choose from the scroll down menu the option "on all pages" they appears.
It seems that the home page is not recognized anymore as the page related to the main menu !??!!?

SOLVED
It was due to sef404 module.
I had to uninstall it. It seems it is blocked some way.
I'll try to remove manually its tables from my database and to install it again.

I hope this can be useful for anyone having the same problem.

Yes, this is why we always ask to test whether the problem exist with default configuraiton. Thanks for posting solution.