I recently updated to Screenshot Captor v4.9.6, from an older version.
My default directory for screenshots contains various files, and a PDF file (which has no relation with a screenshot).
Whenever I restart my computer this PDF opens in my PDF reader ! This annoyance seems to come from Screenshot Captor that scans the directory and only finds the PDF file (no image in the directory), and runs the reader on it.
In Preferences I could not find a way to avoid starting the PDF reader when selecting a PDF file. In fact I don't want this feature introduced in v4.9.5. It would be enough to start the reader with a double-click on the file.
A screenshot captor is primarily used to create an image, not a PDF.