A forced upgrade means I have a new 2015 MacBook Pro, Yosemite, and XQuartz 2.7.8_beta3 (xorg-server 1.16.4) freshly installed over/under a restore from via Time Machine. Previously I was running 10.6.8 :). So. If I pop up an new Xterm and start typing in many cases a few characters in the typing cursor will transition from solid block to rectangle. Naturally this means my input is lost. A few seconds later it will transition back again. At that point I can continue typing. Sometimes when the keyboard focus departs I get a beach ball. Sometimes when it departs it never returns, but if I click in the terminal I can restore it. I can occationally get this to happen without typing. I just open the xterm and start and the black keyboard cursor and after it bit it disappears, optionally I see the beachball, and optionally it comes back after a bit. This behavior occurs dependably and repeatedly if I have work to do. I occurs less reliably if I’m trying to reproduce the behavior or record it in a screen capture. But even if I do record it it’s boring because all you see is the cursor changing. Is anybody else suffering this affliction? Or would anybody like to suggest a treatment of big stick I might hit it with? - ben ps. Emacs is hell when you have this issue!