Default content page doesn't show anything, even though the short code is in the page.

Hello,

I'm trying to integrate WHMCS to our Wordpress installation. I've followed all the instructions, including putting the [wcp_content] shortcode on my default page, however the page still shows blank. I've double checked with our WHMCS expert and the settings all seem to be correct. Is this a common issue, am I missing something?

Thanks