Text partially deleted when I click "publish"

Hello,

I copy/paste text into a post on my blog and once I click publish, most of the text disappears.

First, I deleted the post and tried again. The same thing happened. I checked the HTML to see if anything had sneaked in, but only the text I wanted was there. Then I tried with a different block of text and that time more of the text remained, but it was still cut off.

When I try to preview the post, the same thing happens.

I deactivated all my plug ins but nothing changed. I didn’t update my blog between successful posts, also.

Finally, I tried to post again in Chrome (vs. Firefox) and no luck.

Thanks for any help!