A few days ago I tried to apply two RPU's online, but the site blew up on me. Called in, the agent said the upgrades were applied but it threw an error because one of the segments in the Roundtrip was an ERJ with no F. She fixed it and it now displays that I'm in F but now also has "A modification has been made to your itinerary. Please..." I am almost positive nothing else has changed other than these upgrades so I have yet to call, I should probably do that, don't want to lose my EWR-LAX upgrade.