Greetings Scot, I have just encountered this issue. We are in Moodle 2.3.2+ and I had a faculty member report that students could not submit to the Assignment. I checked all settings (they were fine) and then went to the gradebook - where the column was tan and all students had been set to Override. i have unchecked the override and sent your information in this discussion to the IT staff.
There is another Assignment due next week and the override is checked in for all students. However, the Assingments she created for Week of Nov 19 are all fine.
My question is - is this still an issue that the Moodle developers are working on? Are there special instructions I should provide to my faculty - especially the English faculty - regarding creating a new assignment? Thank you for your help - Nancy K. Hoke