WordPress database error: [Access denied for user:

Here is a question that could be answered with a Yes or No by a very, very nice Word Press volunteer with far more knowledge than I.

I will give you the background and then ask the question.

I am using WP 2.0.1

Suddenly, I can’t publish posts on any of my WP blogs. They are all hosted with the same host, which is why this is probably a problem on their end. I am looking for confirmation on this.

I _can_ edit old posts, change the theme and update options.

When I go to publish a new blog entry, it goes through the motions, albeit more slowly than normal, tells me the post has been saved, but nothing shows up.

After refreshing the main page of my blog a few times, I managed to turn up this error. The onle line extends forever, so don’t forget to scroll right.

WordPress database error: [Access denied for user: ‘dbo227138444@%’ to database ‘db227138444’]
INSERT INTO myblogsname_options (option_name, option_value, option_description, autoload) VALUES (‘rewrite_rules’, 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”, ‘yes’)

I went into MySQL interface, and it says I have 100mb capacity, but am using 150mb, leaving me at -50mb. I’m not certain my four blogs take up that much space, as most of the pictures and videos are hosted elsewhere.

I can access my FTP account (using Wise FTP) and I can change around the folders and stuff.

So, this is most likely a problem with my database. My initial hunch is that somehow I’m no longer able to write to these databases, and should contact my web server, correct?

Does anyone know why this problem may have occurred?