🚀 go-pugleaf

Patrick--

I don't know of any limit on the number of page items on a page or spread--the "cannot undo" message generally comes up when InDesign can't allocate sufficient disk space on the scratch disk to contain the "undo" action.

As Eelko says, turning off the warning messages should help, but you might want to look at the amount of disk space you have free, and the disk fragmentation of the drive.

You might also want to save the document before attempting to duplicate the spread--this clears the "undo" queue and frees disk space.

(Note: I tested this with a page containing 2000 objects, and was not able to reproduce the warning messages.)

Thanks,

Ole