On my 10.5 system, resizing the window causes the screen to get...
wrong. The error makes it look like the lines aren't aligned; things
come out slanted at about right of 10° vertical. If rio's running,
windows sometimes have the left edge cropped to vertical and the
left edge isn't updated with the rest of the window. The keyboard
and rio menus still work, although the fact that the left edge isn't
getting updated makes that hard to see at times.

Resizing to the original size either fixes the problem or yields:
	9vx panic: sigsegv on cpu1
(have also seen cpu4). 

This doesn't happen with the X11 version, but does with the first
native OS X GUI code in 0.11 forward. In case it makes a difference,
this system has multiple displays.
Anthony