Hi everyone, it's my first post on this list,
first, thanks for give us uae back on Linux ;).
Then, there is a X11 issue in UAE (sdl and x11) when exiting, I get this message "Xlib: unexpected async reply (sequence 0x4ae8)!" and I have to kill window by hand. Looking on internet shows this error is generated when X11 receive an unwanted reply.
As I haven't a good knowledge on X debugging, I don't know how to get more information about this issue. But I see in debugging output that the "Exiting" statement is not displayed, so maybe something happen in gtk_gui_thread function.
Step to reproduce : launch UAE, then click on quit button.
Sometime it's not happened with this, and just run emulation then quit is enough.