Hi,

Check the following link,

http://forums.buyscripts.in/frequent...e-uploads.html

If you have enabled the upload progress bar in your vShare script, edit ubr/ubr_default_config.php file and find
Code:
$_CONFIG['max_upload_size']
then increase that variable value from 524288000 to 838860800

If you can't get it fixed, open a support ticket with your site admin and FTP login details.

Thanks,