The vertical line that designates a freeze frame doesn't go all the way
down the spreadsheet in v1.2.1.  (See attached .png)  How far down it goes
differs each time it redraws.  As you can see, the image attached only has
the line to 1/3 of the way down the sheet (based on the scrollbar on the
side).  (It's a big sheet.)

Also, using the scroll arrows on the vertical scrollbar to scroll up 1 cell
at a time causes the cell labels on the left (designating the row number)
to get black lines between them (see 2nd attached image).  Much less major
than the first bug, but still a redraw glitch.