I'm running RHEL Workstation 7.6. Ever since I set it up in November, I've had an ongoing issue with my system (and this is my daily desktop).
On occasion, I'm unable to click on anything. I can alt-tab, and I can type in windows. The mouse will move but clicking does nothing. The keyboard mostly works but, say in a terminal window, I hold down the Alt key. The menu (File, Edit, View...) lights up but if I then hit Alt-F, to open the File menu, nothing happens.
Sometimes I can click on tabs in Firefox and they change - but I can't actually bring Firefox into the foreground, nor click the X to close it.
If I go to TTY2 (ctrl-alt-f2) and then back to TTY1, it fixes it. Until the next time. Sometimes the fix only lasts for seconds but, if I keep trying, it will be okay for a long time - many minutes or hours.
Some log entries while it's acting up. The first one occurs any time I click on a gnome-shell window while it's broke: Feb 22 08:16:33 mybox gnome-shell: pushModal: invocation of begin_modal failed
Feb 22 08:17:38 mybox autokey-gtk.desktop: X protocol error: Feb 22 08:17:38 mybox autokey-gtk.desktop: : code = 3, resource_id = Xlib.xobject.resource.Resource(0x00e11c6b), sequence_number = 46319, major_opcode = 33, minor_opcode = 0
Feb 22 08:17:50 mybox gnome-shell: g_array_unref: assertion 'array' failed