Hi Llywelyn,
Given the call to the method 'format_grid->create_get_imagecontainer()' this no longer exists in the latest version which is designed to fix this issue. Please see: https://moodle.org/mod/forum/discuss.php?d=244610.
Gareth
Courses and course formats
Grid format for Moodle 2.5 and 2.6 updated
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