I also encountered the same problem of being unable to open a previously password protected spreadsheet or save a new password protected spreadsheet. But the problem went away after fully removing libreoffice, purging deb files, reinstalling libreoffice. I suspect that the problem appeared after I cloned my oneiric installation from a HDD to a SSD.
I also encountered the same problem of being unable to open a previously password protected spreadsheet or save a new password protected spreadsheet. But the problem went away after fully removing libreoffice, purging deb files, reinstalling libreoffice. I suspect that the problem appeared after I cloned my oneiric installation from a HDD to a SSD.