I've been doing the same search for the last month, every day, looking for PZ to Tokyo and SIN. In the last few days, I've been blocked from looking at inventory, and timed-out after a few minutes when I do get visibility. Unfortunately, it's just another reason to avoid UA. Kirby's got the the thought police working full-time to prevent scrapers/data harvesting while making it nearly impossible for us normal flyers to book flights on their site.