GIF export error

[alkolka]

Turn snap to grid on.
Create a square, 2x2 pixels.
Turn off both outline and fill.
Export this clear 2x2 square as a 256 color GIF with transparency turned on.
Works fine in both XaraX 1.0d and XaraX1.
Now try it with a 1x1 pixel square.
In XaraX 1.0d, OK. In XaraX1, I get the attached error message.