Product Export to XML shows zero price when wholesale catalog mode is active

I am using this plug-in to hide prices from users non-logged in. And it works fine.
But apparently it causes problem in XML product feed creation.

When I manually refresht the feed on the admin interface, it works fine, as I am administrator, having access to prices. But as soon as prooduct XML is updated every hour by a cron-controlled refresh process, all prices in the created XML feed is becoming 0 (zero), probably because the plug-in handles this request as a non-logged-in user.

Any suggestion how to workaround this?

Attila