bibisco crashes and report a read-only filesystem error.

This usually happens if you don't move bibisco.app to Application directory and you launch it from virtual volume (dmg file).

To solve this you have to simply move the bibisco.app to Application directory using bibisco installer or the Finder (NOT the terminal).

This is due to App Translocation and these links should help you to better understand:

​https://lapcatsoftware.com/articles/app-translocation.html​

​http://krypted.com/mac-security/app-translocation-services-os-x-10-12/​