I've done some more tests. I was able to replicate the problem, but not reliably. I opened the same D800E image file. While still in the Develop persona but with no edit changes, I did a Cancel, then Close document, and closed the application. The same error occurred again. I opened several other D800E images, repeated those steps, but got no errors at all. I repeated again with the original file, and also got no error. It looks like an intermittent problem with the Dot Net framework v4.0.30319, so I looked further in the Windows event viewer. I found an identical occurrence of the same error logged when my normal editor Capture NX2 ended abnormally. Since this seems to be intermittent and only occurs when the application is already closed, I’m going to ignore it. And there’s no way I’m going to go grubbing around in the Dot Net frameworks – that’s asking for problems. Separately, I’d like to add that my impression that Affinity Photo looks very capable. When it comes out of beta, I expect that a lot of people will find it a compelling product to use. I look forward to further refinement of it. Best regards, Mike