Logged in users not able to download files

Hi.
New user to this plugin and wordpress, so please be gentle 🙂

I have enabled downloads using a single url hyerlink – for example;

<a href="http://rideswinley.com/wp-content/plugins/download-monitor/download.php?id=2">example</a>

and also, with my own icon;

<a href="http://rideswinley.com/wp-content/plugins/download-monitor/download.php?id=2"><img class="alignnone size-full wp-image-90" title="Download this track" src="http://www.rideswinley.com/wp-content/uploads/2011/08/Download.png" alt="" width="60" height="60" /></a>

Both of these work without any problems. However, when I enable the ‘members only’ feature, either on individual downloads or using the global setting in the config/general options panel, and then try again, once logged in as a user, it tells me that I must be logged in to download.

So it doesn’t appear to recognise when someone is signed in to my wordpress website.

Interestingly though, when I check out the logs, it does associated any downloads that were downloaded by logged in users.

Any advice welcome. Thanks in advance.