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[Note: I tried to post this as comment, but for some reason it didn't work] I guess it's because the URL of QPixel has changed; probably the code interfacing to Stack Exchange somewhere contains a...
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#1: Initial revision
[Note: I tried to post this as comment, but for some reason it didn't work] I guess it's because the URL of QPixel has changed; probably the code interfacing to Stack Exchange somewhere contains a hard-coded URL that no longer fits. Which makes me wonder: Could the application auto-determine its domain and generate the `redirect_uri` from that? I guess that would be more robust.