Pan 1 2 3 4 versus pan A B C D

[Charlie Bernstein]

Sometimes, for no apparent reason, my pan screen changes from numbered tracks to lettered tracks. When that happens, it won't pan. After a few minutes, it goes back to numbered tracks and works again - again, for no apparent reason.

What's going on? Am I accidentally hitting a command somewhere? Which one?

=O.

Thanks!

Charlie B.