I just discovered that some plugins are screwing my the wysiwyg editor and image uploader so i deactivated them. The following plugin will have conficts if your using Wordpress 2.5+.

• WP-Contact Form - this will conflict you image uploading on post editors
• Add_Lightbox or Lightbox2 plugin or the likes - this will freeze you post editor and you can’t switch from HTML to Visual editor.

I hope this would help some of you who are experiencing the same problems.