Facebook video help!?

i usually always message my friends with videos and for some reason yesterday i went to click the button to record the video and nothing happend like not the record button like the camera icon, when i click it nothing happens. the insert attachment button right next to it is working fine so its not like the whole messaging things you can do isnt working. im really confused and have no idea how i can solve this like i click the camera and nothing happens as if i didnt click it ..so weird!! help!!!