hostingsociety.com, free version:
.htaccess: some rule options like [NC] or [DPI] trigger server error 500 - this should not effect a normal installation, but special rewrite rules e.g. for the I18N plugin or the News Manager plugin
there seems to be a restriction, on how often PHP scripts are called: if many requests e.g. for pictures routed through a PHP script are made in the I18N Gallery plugin, only some of the thumbnails/images are displayed, the other requests return an error