OK, here is something new that started yesterday. I have tried both the HKSAR-English and USA-English website flavors and they act the same.
The unelevated box pops up just fine, and you can populate with data. Clicking the "Search" button will return the normal CX return view about 50% of the time. The other 50% of the time, the webpage will display only two words at the top left: "Bad Request". If the first "Search" does work, and then you try and do a batch search, after a few seconds the page will go blank except for the same "Bad Request" message. This is on Chrome, one tab open, signed in.

The initial URL in this case is: https://www.cathaypacific.com/cx/en_...ts/facade.html
and when the "Bad Request" message pops up, the URL is showing as:
https://book.cathaypacific.com/Catha...g/availability

I hope this is just CX playing with the code. Anyone else seeing this?

OK, I just saw posts #123-125. Too bad. Batch search was terrrific!