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When I'm making a blog post mojopoortal says me tells about a wrong page.
We're sorry but we could not find the page you are looking for. Please try the Site map.
Are you seeing any other errors in the log that might be related?
What url is redirecting to when it is saying page not found?
I constantly encountering the problem since I've installed MP for my new site months ago. No log errors, it seems that when a page is created it doesn't exist in a cache or something and MP redirects to it. When I open an other page in menu and after this come back - it already displays OK. Really I simply don't have time to unravel it. But it happens with every culture and alphabet when I post a new message in blog. If I get more details I write here again, as I understand it's not reproducible with your installation.
I have seen that also many times.
I think it has to do with the automatic url creation when you write a post. Also i think it has to do with the url re-write. I have tried to make it happen on purpose but failed.