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I have been using Affinity Photo for well over a year since I left Adobe Photoshop when they changed their business model and overall I am delighted. I have just experienced a problem with my normal sharpening routine on the High Pass Filter. My routine is: Choose Layer, New Live Filter Layer, High Pass Filter In Dialogue box check monochrome Drag radius slider UP until level of detail to be sharpened becomes visible Get rid of dialogue box Select High Pass Filter Layer Set Blend Mode to Linear Light Choose Layer, Invert With High Pass Filter Layer selected use the Paint Brush tool, take hardness down all the way, increase the brush size and then, in the colour tab, make sure colour set to white. With Paint brush, Click Drag to paint in the sharpening on the areas you want to sharpen This routine has worked faultlessly until yesterday when it stopped. Normally, as you brush over the detail you want to sharpen you can see the effect as you brush but not now. I should stress that in all other respects (layers, filters, masks etc) Affinity Photo is working fine. In particular the Unsharp Mask filter is working fine.I suspect therefore the fault I have with the High Pass Filter may be something I have done rather than with Affinity. Any ideas? I would be very grateful for any help. Bail