one possible cause is that you need to grant write permissions to the storage folder. http://stackoverflow.com/questions/11981621/starting-with-laravel-on-ubuntu
why use FTP when you have the luxury of git hooks ? https://www.digitalocean.com/community/tutorials/how-to-set-up-automatic-deployment-with-git-with-a-vps
This might've caused by many things. First make sure your vhost logs are properly configured.
Turn on error logging or turn on show php errors temporarily.
Also check the apache access log. i'm sure this is a apache mis-configuration.
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