Hi tklingman,
Thank you for using the Support Forum. To print to the #9 size envelope you will need to use the instructions for printing to custom size paper. You did not specify which ColorQube you have but here are the instructions for printing to custom size on the ColorQube 8900 and here for the 7120.. The instruction will be similar for other machines and can be found by going to the support page for your machine and searching on "custom". I hope this information helps.
I am attempting to print #9 envelopes to either of these machines. This is maddening as we can't get either of these machines to accept this size either when put in the regular trays or the bypasss tray. This is maddeing because this size is not that different than the #10...While I would understand that it might not be accepted by the regular trays, considering that the bypass tray will adjust to a #9 size, why wouldn't it print. Can anyone say definitively that it simply can not accept #9 or does anyone know a way to fool the machine into printing.