When I place markers on my audio tracks with names and comments, the boxes do not show up in the canvas window (or anywhere else for that matter). The boxes show up for the markers on video clips and markers on the timeline, but not the audio markers. I can't place the markers on my timeline because I'll be moving audio clips around. Is this supposed to happen or is there a way to fix this?
I know this is an old post, but I was in this same situation and found a workaround.
I too had an audio (only) clip in the timeline that I added markers to, but then was unable to see the info on the marker. Frustrating.
My solution: I opened the clip in the browser, used my 'go to next marker' keyboard shortcut to land on a marker, THEN used my 'add marker' keyboard shortcut to pull up the 'edit marker' window and voila! There was my info. It wasn't displayed in the little box like it is in a video clip, but at least my info wasn't gone forever.