New plugin version not showing

I’ve added a new version 0.6 of my plugin “http://wordpress.org/extend/plugins/schemafeed/” yesterday. However, my old version 0.52 in the Installed Plugins screen is not showing the message “There is a new version of SchemaFeed available. View version 0.6 details or update automatically.”. So I’m thinking, other users won’t know there’s a new version available? My trunk and tags all seems to be ok.

Can anyone help? Thanks in advance!