LXP no longer detects Behringer X Touch

I've been using the X Touch for several months now, and though it occasionally loses sync with LXP (remedied by power cycle) I've had no other serious issues. And it is lovely to use, especially for mixdown and mastering. Zooming in and out and the scrub wheel are also much appreciated.

Today, though, I just cannot get LXP to recognize the X Touch at all. I've tried every old trick in the Control Surface section of LXP itself. Deleting, re-adding manually as Mackie device that it emulates. Nope. Nothing.

I've deleted the com.apple.logic10.plist and com.apple.logic.pro.cs files and restarted my machine. I've tried everything available on the X Touch itself to get logic to see it as an MC device over USB. I've checked the USB connections. Again nothing.

Hilariously, my month-old NI Komplete Kontrol S49 Mk 2 ALWAYS installs itself in Logic, after prompting for my permission. It and the X Touch were working fine together -- until today.

Ideas?

Thanks,

-Patrick