Just now I was also told by UA MileagePlus Desk staff that it is no longer in using UA MileagePlus miles certificate, which I am keeping always in my hand, to upgrade LH metal flight with StarAlliance RTW ticket, although I could upgrade at May 2004 with StarAlliance RTW (YRWSTAR). LH allows to upgrade a person, who has a normal fare or a PEX fare basis ticket only, with UA mileageplus miles from now on.
However, SWU is still available to upgrade LH metal with StarAlliance RTW on stand-by basis.
I guess this is related with recent change of LH M&M.
I'm upset...... and should use SWU instead of UA MileagePlus miles certificate.
It was already posted in here.
http://www.flyertalk.com/forum/showthread.php?t=339148