Cannot remove alpha areas after crop resize

[TomR55]

I am using the latest version of Affinity Photo for Mac Desktops (1.8.6). Seems that I can no longer "inpaint" alpha areas that result from cropping, straightening, etc. I am sure that I'm working on an unlocked Pixel layer (TIFF scans). I apply a crop (3x2 aspect ratio), adjust often leaving alpha areas around the borders of the image. 

I used to Rasterize and Trim(?). Then Select Partially Transparent (alpha range). I get the dancing ants. Great. Then I Grow that selected area by 1 to 2 px. Then I attempt to Inpaint (from the Edit Menu). Affinity acts as though it's doing something, but the alpha area(s) remain.

Again, it's been a while since I have had to do this and I'm assuming that I'm missing a simple step. 

Any ideas/suggestions would be greatly appreciated.

Thanks.

[stokerg]

Hi @TomR55,

This is working for me on my Macbook.  

Could you attach your afphoto file before you do the Selection and Inpainting Step and i'll be able to see why it might not be working in your case.