I created issues in the
BitBucket repository (so I will not forget them ...). The Black Screen of Death seems very annoying, I will give it priority.
The other issues you have with the database not being properly updated for documents in recently added, recently read and cbz files puzzles me. As far as I know there should not be any difference in handling pdf, html or cbz. Could it be that your global.db file is corrupted?
You can use
SQLite2009 Pro Enterprise Manager it is a freeware tool that I use on windows to inspect sqlite databases. It has a menu-option 'Integrity Check'.
I will also do some experiments myself.
Does anyone else have simular problems with files not showing-up where they are supposed to show up?