Your comments

Thanks for your reply! 

As I said, setting the encoding to UTF-16 solves all my PDF issues for now, and negatively affects only CBR files - converting these to CBZ is no problem really. So while I would sure welcome such a "plug", I can live without it indefinitely, too... :)

As for the PDF memory leaks, I don't scan my library every day, so again no problem to work around the issue if and when needed...

After some fine-tuning of my system settings, Ubooquity runs very smoothly, and I am in love with it! Many many thanks again for your work!