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Hi, I am working on an iMac running Big Sur version 11.3.1 with the Affinity Photo Desktop version 1.9.3 and am having a problem with Focus Merge. I ran a few different Focus Merges on RAW image files earlier today with no problems. Then I ran a focus merge of 35 raw images of 43MB each and this time I am getting a blur on the left side and bottom of the output composite. When I look at the source files (where the left side of the original image is in focus) the source images show a weird corruption of the left and bottom edges just where the composite is blurred. There is nothing wrong in the original RAW image files that I used to generate the Focus Merge so the problem is created during the Focus Merge process. I have tried this particular Focus Merge (quitting AF in between trials and selecting the same RAW images) now 3 different times with the same result. I will include 3 screen grabs to illustrate the issue: one of one of the original RAW images I used, opened in Affinity Photo to show that there is nothing wrong with the file - one of the output of the Focus Merge showing the composite with blurred edges - and the last revealing one of the source images with the strange corruption. I hope you can fix whatever bug caused this problem. Many thanks, Sandi PS - out of curiosity, once I had the Focus Merge output, I wanted to open one of the original image files in Affinity Photo in a second tab to see that that file was fine but once I did, clicking back on the tab where the Focus Merge output was, I lost access to the panel with the source images. I could not find out how to bring that window of the source images back.