I'm working on a 176 pages PDF document with Acrobat Pro XI. I've been adding IDs/headers on cells when the table is complex. I'm at the middle of the document and I cannot add anymore IDs oh heading cells, The button "ok" (in "properties of table cells" of the table editor) seems not working, without showing any message or warning. I've tried to delete IDs but I still cannot add new IDs. Is there a limit or something else in Adobe Pro?