I was just about to create a thread about this. I had the search bar issue a few weeks ago, until I realized that I COULD actually type in the search bar, but simply didn’t realize it because no blinking cursor was appearing when I clicked on it. Not sure if that’s your issue or not regarding the search bar.
However, regarding the text size, yes, I have that problem too. On small, all of the UI I’ve experienced is rather clear, except the trading post text. It’s readable, but only just so. It’s like the text is shrunk too small and it can’t be anti-aliased really well. I’m not sure, and it’s not enough to make me use a larger UI size, but it’s certainly annoying.