I am running a Moodle 3.1.2+ (2016052302.07) with PHP Version 7.0.11-1
The problem occurs when trying to give grades to students, URL like moodle/mod/assign/view.php?id=XYZ&userid=ZYX&action=grader
It says "illegal character", and it seems the problem is with && character that are missing an empty space before them.
I am attaching a screenshot of the error.
I already reset the cache (both via web interface and cli) and the theme cache. I tried with elegance theme and also the Clean theme.
There are some non-default plugins installed, like poodll submission.
Anyone facing similar problems?
Any ideas for solution?