error message on firefox

The following errors occurred with your submission:

1. The message you have entered is too short. Please lengthen your message to at least 5 characters.

i have been receiving this for a while when using firefox even when i have typed a long reply of over 30 characters any ideas??

i often login from work, i get the firefox problem so i have to use chrome, but at home when i use firefox the site hangs also so i have to open wait for it, IE!! which i hate using but i have no choice, does the site have some hang ups with ff??