by Randy Morrow.
The max_input_vars didn't work for us. I had to go in and change the value for their options and then tell them to not go above a certain number of records. I may try to alter the code to remove that drop down for number of records until there is a real fix.
In the Moodle database:
SELECT * FROM mdl_user_preferences where name='assign_perpage';
It's different depending on the number of records. For one instructor I had to make it 20 for another I had to make it 10.
You will need to know the instructor's user id number. In this case it was 3.
UPDATE mdl_user_preferences SET value=10 WHERE userid=3 AND name="assign_perpage"
I know it's not the real fix but it helped us for now.