4
1) I can confirm the blank page too
2) It doesn't matter that "you" didn't turn on any SEO. If you installed recently a module and it does have SEO or one of its blocks, it might cause problems.
For example,
this page works just fine.
Which would tell me that a module that is currently the starting module, has a problem, or one of the recently installed modules that has a block on the first page, is causing the problem.
So you have to go back and check the recently installed modules, deactivate them one by one, and check each time if the Website is working. I am sure, you'll find very quickly the module causing you problems.
BTW - the
Recipes link, that is using Publisher, doesn't work