This is an immediate follow up to the 5.2.6 release which adds backward compatibility for older versions of the ioncube loaders.    CubeCart 5.2.6 will work with PHP 5.2 to PHP 5.5 with Ioncube 4.4 and higher CubeCart 5.2.7 will work with PHP 5.2 to PHP 5.5 with Ioncube 3.1 and higher   If you have already upgraded to 5.2.6 and have an Ioncube version error please download CubeCart-5.2.7.zip and upload the /controllers folder over your existing files to resolve this issue. To remove the v