ROSA Linux Bugzilla – Bug 6822
php-gd API mismatch issue
Last modified: 2016-03-09 01:16:40 MSK
PHP Warning: PHP Startup: gd: Unable to initialize module\nModule compiled with module API=20121212\nPHP compiled with module API=20131226\nThese options need to match\n in Unknown on line 0
Are you sure you have the latest php-gd installed? It is built as part of php itself.
You were correct, some how php-gd remained version 5.6.16.