Shortly after launching Papers for Mac, when running El Capitan 10.11.2 Beta 3 (154C0a), Papers for Mac crashes. You may see lines similar to this in the crash report:
1 com.apple.PDFKit 0x00007fff8f007a9b -[PDFAnnotationInk dealloc] + 110
Open the App Store and update to El Capitan 10.11.2 Beta 4 or later.
If you're still experiencing this issue after updating, please contact our support team.