I have long been waiting for upgrading Papers 1.9 as it is getting so slow with 10,000+ PDFs; there are notorious bugs that were never fixed (just delete an entry and see what happens). With the big hype around Papers 2, I hoped that all these problems would be cured while I also urgently need OCR, annotation and citation management.
When reading at the new support forum at http://support.mekentosj.com/discussions/problems/3118-papers-2-going-back-to-papers-1 of all the glitches introduced instead, it is probably time to say good bye now to Mekentosj.