Hi, I guess I found a bug that occurs when you have a non-zero offset with multiple rows.
I have my frames ordered vertically; 15 rows, single column. The whole image is 256x256. When I got the following settings:
frame size: 64x16
offset: 16x16
columns: 1
frames: 15
the first frame is shown on the preview, others are lost (going to wrong coordinates).
When I move my image to the left of the canvas and set the X offset to 0 accordingly, the frames are displayed correctly.
It looks like the offset value is only added to the first row.
Thank you for this useful plug-in!