We had the exact same problem. Please follow these instructions. You will have to set up the Inserter Module to detect the fed paper size:
Log in as Admin.
At the control panel, press the Machine Status button, then touch the Tools tab.
Touch System Settings > Common Service Settings > Maintenance > NVM Read/Write.
To enter the NVM code 769–503, for Chain-Link, in the first box, type 769. In the second box, type 503. Touch Confirm.The current NVM value appears.
For the paper that you are feeding into the Inserter Module, for New Value, type 0–4 as appropriate, then touch Save.The values for the fed paper sizes are listed:
If you're inserting a cover using tray T1, you MUST have the press "auto select" the page size if it doesn't staple with the "custom size" you've provided.
IF the press doesn't choose the correct "auto select" size, simply move your inserted cover to a different tray that can "auto select" the correct size.
The issue IS that the press, for whatever reason, doesn't register that it can staple certain sizes of paper despite clear evidence otherwise. The confusing bit is that the press will (on occassion) staple a book that you've provided "custom sizes" for. But, if you ever experience the press not stapling your book, always check that the paper sizes are "auto selected" and if they're not, change trays until they are.
After printing is the Center staple option still selected when viewing the job properties in Command Workstation?
If it is not, will it then work if you enable it there and reprint from Command Workstation?
If all looks good with the above, does it work when doing the job as a copy?
I have printed letter size booklets with a half fold, center staple with no problem. Now that I am trying to print a half page (5.5x8.5 finished) it will print and fold the booklet but with not staples?? I checked and the center staple option is on. Any suggestions??