On Wed, 30 Nov 2016, David Borman wrote:
Michael, The problem with the jumping windows started with Yosemite and continued with El Capitan. As of Sierra, the problem has gone away. As far as I know, it has never been understood or explained what caused the behavior, and what changed with Sierra to make the problem go away. It is definitely an interaction between quartz-wm and Mac OS, if you run a different window manager you don’t have the jumping xterm issue. The wiindows don’t randomly jump, it is very predictable: the x and y coordinates of the upper left corner of the window get doubled.
Yeah, I noticed that the jumping wasn't random, they always jumped to the same place, but it didn't quite seem like a doubling of both coords, as my Y coord for all terms was set to 0. Again, this is brand new behavior for me. I'd seen it being discussed on this list, but I did not experience it until 2.7.11. I'm not necessarily complaining, just trying to add more data points about the behavior.
My recommendation is to upgrade to Sierra to resolve the jumping window problems.
Others have reported differently.
As to not being able to open new xterms, if you still have any working xterm windows, try starting up an xterm directly from that window. If it fails, you should then see any error diagnostics from xterm for why it was unable to open up a new window.
New test this morning. CMD-N will not launch an xterm. From an existing xterm, I can run other X-clients, like 'xlogo' or 'xload', but 'xterm' just sits quietly there and never produces a window, no errors. However, from an xterm logged into a remote system, I can thrown an xterm back to the Mac's X11 display.
-David Borman
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