Html links – URLs not displayed

Hi,

Despite a correct html code (source view), some links edited in my posts that point to external pages won’t be displayed to frontend users anymore (WP 2.0 /any browser). Preview shows the links properly, but when published, the links just vanish (only regular text remains). I made some updates of the Category Order plugin, that works fine now, deleted a useless .htaccess file, then disabled and enabled again all plugins (like Chenpress 3.1.1) that could cause the problem. The problem’s still there. Any troubleshooting tip would be deeply appreciated.