Timeout on publishing lost post

A clue. I’m a few hours later and I publish the ‘long post’ (332 words) without problems. I noticed that the image I used is not alligned correctly and the quickest way to solve that is using the visual editor. So I center the image, hit ‘update’ and guess what…?

I have experimented a little. I disabled the visual editor, no result. I tried making a new post, no result and it doesn’t matter if that be a custom post type or just a post. Then I edited the post directly in the database, it saves without problems, but I noticed that when I edited something later, like the comment status which for some reason always defaults on ‘closed’ in these occasions, the larger part of the post is deleted (the 68 words)! Does that mean anything to anyone? Could that mean that WP is not the problem?

[edit] according to the wp security plugin “PHP Memory Limit : 256M”, that sounds enough, right?

Argh, the database ‘fix’ is but temporarily. I can make the post working and leave, but when I check back after some time, post post content is cut off, this time after only a few words (and in the middle of an html statement which makes the whole blog go crazy). What could be going on? The post breaks when WP has to get it from the database?

[edit] and now I can edit the post without problems, that is to say, besides the fact that the built-in image-additor makes an incorrect alignment code. No timeouts, no half posts, no clue ??