Add New Plugins – problem since upgrade to 3.0.1

Add New Plugins still adds new plugins, but there is no progress meter.

All it says is:

‘Downloading install package from http://downloads.wordpress.org/plugin/hello-dolly.zip…’ (or whatever the plugin is)

There’s no status messages saying ‘downloading – unpacking – do you want to activate’ etc.

Any ideas how to fix?