I have recently downloaded quite a few images and for some reason it repeatedly keeps missing some of the files marked for download.
In my workflow I shoot JPG+NEF and download the images in pairs into folders named by date picture taken, e.g.: 2018-10-02
The pairs get renamed in pairs from something like "_DSC8222.JPG+_DSC8222.NEF" to "PX_10624.JPG+PX_10624.NEF" using a script that Hert provided (the script allows me to enter a prefix and adds a sequence number storing the last number used for that particular prefix in the registry).
Then I use the DNG converter on the NEFs to generate DNG copies of all the NEFs, use "Verify Folder" to make sure the DNGs show up and then use "Detect Versions" to keep the triplets of JPG+NEF+DNG together.
Doing that I first thought the version detection wasn't working, because I ended up with different versions of images in the same triplet. But then I noticed the files are named the same, but the images were different:
Comparing the images with the folder from which I downloaded the files showed that quite a few files had not been downloaded AT ALL. PSu simply had skipped these files...
It seems that more often the JPGs are skipped, but occasionally also the NEFs are not there.

This is really annoying, because it means I can no longer trust the downloader to get ALL images that I want into PSu...
I initially started to copy the missing files manually and rename then and then re-version by hand. That worked for folders with only a few missing images. But in one case almost 10 images out of 30 were not there. Which files are not copied seems entirely random, I cannot detect any pattern...
Anybody else having the same problems?
Frank