Repro Steps (I don't know about how reliable these are, but this is how it occured for me)

1) Create a new Page ('Master')
2) Create a new Component ('Background'). Add a video file inside it.
3) Create a new Component ('Midground')
4) Add both Components to the 'Master' page, both within the same Grid. Close all open tabs to refresh them.
5) Open the Master, and add 3 rows to the Grid containing both Components. Make each row 1* each.
6) Assign the Background Component to span the top 2 Rows.
7) Play around with the Alignments and dimensions of the Component, randomly click between Alignment modes, and type in a fixed width of 1920.
8) Revert all of the things played with to what they originally were.
9) Right-Click on any of two first row Adorners of the Grid containing both Components (to attempt to delete a row)
Observe Studio crashes.

Expected Results: Grid Row Definitions can be adjusted at any time without crashing.