Greetings.
I'm following this topic (mostly the first post) quite a while now, and as i see the comments, this application reached somewhat-stable state and only new features being created/debugged on the newer releases, so i decided to install this application, for the very first time.

So i installed v0.56-1, restarted phone (with keyboard open) and the bootmenu shown me 2 options: boot from internal card, or switch off (by default, it was on a blank area).
If i choose boot from internal card, the phone crashed and switched off. There was no "backupmenu" or similar option.

The only way was to boot up the phone is to close the keyboard.
After bootup, i headed to /etc/bootmenu.d/ and i found a backupmenu.item, edited this, it pointed to some file in /ush/share/backupmenu/ (sorry i can't remember exact filenames and pathes from head) so it seemed that it should work, but don't.

After this, i used apt-get and removed bootmenu-n900 and backupmenu (with --purge), checked the pathes above if any file remained, reboot (with keyboard open), N900 booted up normally so i confirmed that the softwares were removed properly.

Next i installed bootmenu-n900, and downloaded v0.55-1 from the link of the first post because that is mentioned the latest stable/tested version, i installed it manually via dpkg -i, then reboot again, (keyboard open) and again 2 option from bootmenu, booting from internal card crashes, after booting up maemo i checked files, they was in their proper place.

The only extra package what i use and may cause some trouble is "Enhanced Linux kernel for power users" version 2.6.28-maemo42.