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Hello John, yes I used the Nik Collection uninstaller and then re-installed. All of the other plug-ins appear to be working ok, although I have not used the Nik Collection before, so would not necessarily be aware of less obvious problems. In Affinity Photo preferences, all of the plug-ins are shown as "unknown" except for Color Efex Pro 4 and Analog Efex Pro 2 which are shown as "working", and yes I have ticked the box to allow unknown plugins to be used. I have never had the previous google free versions installed on my computer.

Hello, I am running Affinity Photo 1.8.1 on an iMac with OS Catalina version 10.15.3 and I have installed a free 30 day trial version (not the Google free version) of NIK collection 2.5.0 . Yesterday I opened the Viveza plugin via the filters menu in Affinity photo and edited an image. This worked successfully and I exported the the image and closed it. I then opened another image but when I opened Viveza, Affinity Photo immediately crashed. I tried re-opening the original (unedited) version of the first image but again opening Viveza caused Affinity Photo to crash. I tried with several other images, all with the same result. I then opened some of the images in DxO PhotoLab 2 (which comes bundled with the NIK collection) and edited them successfully in Viveza. This morning I decide to try again with exactly the same results i.e the first image edited ok in Viveza and Affinity Photo crashed every time thereafter. Has anyone any ideas how I can resolve this please?

I am also having this problem, Mac OS X 10.15.2 Affinity Photo 1.7.3. The image is a poor quality jpg from a scanned image that I am trying to improve. I tried setting the radius slider all the way to the left as advised above, but affinity photo still crashes every time I click apply.