In certain situations midi mixer slots dissappear. I haven't replicated the conditions as to how this is happening but it's happened a few times.
When a certain window is on top of the midi mixer and is then closed,
whatever channels that window was covering are not visible anymore.
(You will have midi channels 1 to 9 for instance and the other slots will seem to have dissappered). If you click in the area where each channel is supposed to be, they magically appear.
Anyone else come across this?