If a user cannot edit a column that is normally not editable, what should you check?

Checking the Field Set on Project Task is the correct approach in this scenario because Field Sets define which fields on a page can be added, removed, or edited in a given context. If a user cannot edit a specific column that is typically editable, it's likely that the Field Set configuration needs to be reviewed and updated to include that column.

Field Sets allow administrators to control access to fields based on the context users are operating in, which means if the relevant field is not included in the Field Set for the Project Task, the user will not have permission to edit it despite its normal editability. Therefore, ensuring that the Field Set is properly configured can resolve the issue of inaccessibility for the user.

Other options, while they might seem relevant, do not directly address the common issue of column editability related to field configurations. For instance, deleting a column or upgrading a user’s profile might not resolve the current accessibility issue and rebooting the system is not a typical solution for editing permissions in the context of user permissions and Field Sets.