Kirsty Gilmour lost her second Grand Prix final in three weeks, coming up short in Orange County, California.
The 22-year-old Scot won the first game against Pai Yu-Po but her Taipei opponent came back to win 18-21 21-15 21-15.
Gilmour is the clear leader in the race for the women's singles place in the GB squad for Rio 2016.
England number one Rajiv Ouseph lost 21-19 21-12 to South Korea's Lee Hyun-il in the men's final.
Commonwealth silver medallist Gilmour was runner-up at November's Scottish Open in Glasgow.
Gilmour, who enjoyed a successful autumn with wins at the Prague Open and a first Grand Prix title at the Dutch Open, will now aim to end the year on a high when she moves on to this week's Mexico City Grand Prix, where she is eighth seed.