Hi,

there exists a Mastodon project (opening will fail fidning image data, please open with DUMMY instead) in which the TrackScheme will not render a complete tree, will leave blank regions instead -- it happens at various scales, see below. The project above will open windows, in particular a TS window with a view set to demonstrate this effect.

The first view:

Resizing the window doesn't necessarily help:

Fails unf. even on a different scale:

(when zoom-in vertcially a bit, it get's better-- also a proof that the data is/should be there)