'Transparent' area is brown.

[Black Jack Davy]

I add an alpha channel to my uploaded jpg.

Whichever method I use (lasso tool, eraser) shows the area I wish to remove as the usual two-tone grey squares, but when image is exported as .png these areas are not transparent but a brown-grey fill.

No change in method I've been using before. Is it a 3.04 thing?

Thanks in advance for any suggestions or assistance.