20 Segment paper ticket purchased/ticketed Aug '05, had some late stickies before pickup from CX CMB on October - nicely done and stamped.

After collection, two OPEN segments (AA) were booked and changes were made to 3 other segments - 1 CX, 2 AA. (Date/Time, not origin/destination/carrier)

None of these 5 changes had stickers and there were no problems encountered upon check-in with vouchers showing original flight/OPEN.

So, the answer is NO.