Problems of this nature usually occur when there is a problem with your internet connection. When uploading future responses try switching your internet source (e.g. from wifi to 3G or vice versa). This should help you upload videos.
We recommend uploading your videos over Wifi and not using your mobile network.
If the upload is stuck try quitting and restarting the application.
If it doesn’t help then try reinstalling Voxpopme and this should solve the problem.
Contact firstname.lastname@example.org if you continue to have a problem.