I need to book flexible/refundable fares. Typically Y/B, sometimes F/A/Z. Am I the only person having problems getting the new ua.com to behave in this regard?

For example, if I put Y, B in the fare class search box last night for a CLE-PHL yesterday, it told me that "Economy (Flexible)" was unavailable for all of the options listed, and the fares under "Economy (Lowest)" were all S/L/Q/etc nonrefundable/penalty fares... yet all of those had Y9 B9 inventory.

It seemed like UA.com was actually trying to offer me the opposite of what I explicitly searched for.

Thinking that the backend may be getting hung up on "Y=Any Economy" rather than the Y farebucket I tried just "B" and got exactly the same results. Searching for F/A or A only got me a bunch of P first nonrefundable options.

And then on the "mixed cabin" options I was looking at did something stupid like a F fare on one segment and then a L fare (instead of Y or B) on the second

Is there some trick I'm missing or has UA shaken up the fare class structure (is there any comprehensive list of which classes are penalty-free?)