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Open the two PDFs with Preview Drag the thumbnails of the second PDF to the end of the first PDF but above the grey line (marked with the red arrow): and finally export the resulting PDF to a third PDF. If your first PDF contains just one page this doesn't work. Workaround 1: Open your second PDF, then open the first PDF, drag the single page to the ...
Instead of rebooting, you can simply enter "killall quicklookd" in Terminal. That fixed it.
Look at /Users/(your user)/Library/Containers/com.apple.Preview/Data/Library/Autosave Information/ That's where mine are right now.
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