Are you still running the same install or did you upgrade?
If you are still having the issue:
1. Look for AUTOLOAD_RESTRICTED in the workorder.xml file under your distribution service.
2. Once you find this go to the DayOfWeek attribute.
3. If it has an empy string such as DayOfWeek="" then that is causing your issue.
4. Go to the task in QEMC and no check boxes will be checked for the day of the week to pre-load.
5. I am running Version 9 SR6, and have logged a defect with support. (bug ID 38754)
Let us know if this was the same issue for you.