[D43m0n]

Nope, but that sure looks like DisplayLink driver vs WindowServer again... I see it too in my console log...

Sigh...

I've ran the "DisplayLink Information" support tool to gather information about my Mac, with the latest 2.4 (no beta) driver installed, but without both DisplayLink monitors disconnected. I'll run this tool again when both DisplayLink monitors are connected (perhaps there's a difference in output?).

I uninstalled the last beta of 2.4, rebooted, installed the official 2.4 driver, rebooted and then connected one DisplayLink monitor, followed by the other as soon as the first showed me a desktop (just to be sure no firmware updates were in progress).

Later today, I (again) had a frozen MacBook. Only the mouse was responding, nothing else. The usual trick to get everything working again without rebooting, didn't help unfortunately, I had to force shutdown my MBA. The usual trick is to unplug the USB connection and wait until al opened windows appear on the internal screen of my MBA, and then replug it again.