This is just a low priority improvement suggestion:
The vertical alignment of the Grouping Matrix is so that the matrix is centered in the pane without regarding the vertical tags at the top. In order to read them I have to resize the pane.
If the matrix were aligned to the bottom instead of centering, it would be more helpful. Maybe centering could be enabled when the total height (including tags) is taken into account, but when that height is smaller than the pane height then align to the bottom.
I noticed that the same applies to Region Render from the screenshots in this thread:
http://forum.cockos.com/showthread.p...rouping+matrix