On a Parallels Virtuozzo container with Parallels Panel 9.2 or 9.3 installed it is possible to receive the issue, when web applications can not be installed if VZPP feature is enabled for the container. It looks like an endless process of loading the web-application page inside the Panel.
It is necessary to replace the %plesk_dir%\admin\htdocs\domains\hosting\site_app_pkgs.php
file with the attachment
. See the http://kb.sp.parallels.com/en/1802
article about hot-fix installation procedure.