All works fine except the 'reports' folder was not created by the plugin - I uploaded the plugin in FTP mode which might have something to do with it.
Also the formatting has got a bit messed up in WP 3.2.1 but it's nothing that stops you using it.
Look forward to an update at some point.
Ideally I'd like the time selection to be different - perhaps the default end time should be the users current time?
Or maybe have this as an option.