@Tom-Elliott I am having the same issue, here after upgrading from 1.5.10 to 1.5.10.1698.

The symptoms are:

• Nothing appears under “Kernel versions” in FOG Configuration when I press the corresponding button below. In previous version I got the right versions.
  
• In Apache logs I see the problem: a malformed URL
  “POST /fog//fog/status/kernelvers.php HTTP/1.1”
• If I put the correct URL in my web browser, I get the results ok:
  

So the problem seems to be how /var/www/fog/lib/pages/fogconfigurationpage.class.php is forming tha URL.

Thanks in advance!