I am presently at LHR on a OWE4 in FIRST. THe hastle of an open ticket was obvious when I was checking in at LAX and the BA agent said that since the RTW ticket was issued on QF ticket stock, I would have to have QF put a sticker validation on my ticket before they would accept my ticket. THE EXACT same problem happened at terminal 4 this afternoon when I checked in for my flight from LHR-JNB. I travel on many RTW per year. This is the first time I have had OPEN segments, despite calling BA and making sure my exact ticket number was in the reervation. It was finally done but it was a bit of a hastle.....