I just downloaded some photos from an SD card I’ve been using for a while, and it showed a lot of them as not downloaded despite having been downloaded with RPD before. I hadn’t changed any settings recently. And it wasn’t all the photos, just the ones taken in the last few months. Any chance this is a daylight savings time related bug? It’s the first time I’ve downloaded photos since the time change. (I didn’t think to check which photos it wanted to redownload exactly and whether that matched up with the fall change, but I think it approximately did.)
Is it possible that your camera is set to obey DST but your computer is not (or vice-versa)?