Sounds like you're using an old skin in a new version. Try using the custom skin that came with your upgraded version and see if that gets you going again. When that works out you'll want to check out the manual for upgrading skins to see what you need to do about upgrading your existing skin.

Dear EdB,

I replaced everything within my files, including of course the skins. By the time being I had revert to the 0.9.0.12 version to keep my blog up and running, and beacuse the rss's and podcasts I have based upon it.

What else could be? I'll give another try as soon as I a can.

Thanks again! :)

Okay that was a guess based on available info, but here's a scenario worth considering...

It is possible that your server has date/time info about files that is newer than the latest release AND that your FTP program only over-writes newer files. If that happens then you could end up not over-writing files that need to be upgraded, so the 'stock' upgrade procedure is to delete everything (from b2evo!) on your server and upload all the new stuff.

1.8.1 ("milestone") works, but since you have a problem there must be a problem that you need fixed.

Is it possible to simply delete all the files from your server and upload the newest version? Assuming you've run the installer (to upgrade your database) then the files will be no problem. None of your settings or info are stored in files, though it's important to not delete stuff that's in your media folder. Obviously b2evolution isn't zipped with your files in media!