[Ripplinger]

It's the "ePub fixed/adjustable top/bottom margins" patch in libnickel that's causing the reader to reboot when opening a book.

And something odd, when I enabled the "Remove recommendations (row1col2) from home screen" in nickel the first time by manually editing each file, it created the KoboRoot.tgz file successfully. For all this testing though I used the kobopatch.yaml to enable all patches, and when using it, it pops up with a fatal error and fails to create the file. Possibly it's not compatible with "Remove footer (row3) and increase cover size on new home screen" and I missed a warning?

These are the patches I enabled, in case there's a conflict between the 2 I'm having problems with that I missed:

Spoiler:

overrides:
  src/nickel.yaml:
    Show all games: yes
    Remove recommendations (row1col2) from home screen: no
    Custom reading footer style: yes
    Dictionary pop-up - increase available text area: yes
    Increase the cover size in library: yes
    Increase the view details container size: yes
    Remove footer (row3) and increase cover size on new home screen: yes
  src/libadobe.so.yaml:
  src/libnickel.so.1.0.0.yaml:
    My 24 line spacing values: yes
    Custom left & right margins: yes
    Custom font sizes: yes
    Freedom to advanced fonts control: yes
    ePub fixed/adjustable top/bottom margins: no
    Custom kepub default margins: yes
    Custom footer (page number text): yes
    Fix three KePub fullScreenReading bugs: yes
    Force user line spacing in KePubs: yes
    Force user line spacing in ePubs (part 1 of 2): yes
    Force user font-family in ePubs (Part 1 of 2): yes
    ePub constant font sharpness: yes
    KePub constant font sharpness: yes
    Always display chapter name on navigation menu: yes
    Clock display duration: yes
  src/librmsdk.so.1.0.0.yaml:
    Disable orphans/widows avoidance: yes
    Default ePub monospace font (Courier): yes
    Force user line spacing in ePubs (Part 2 of 2): yes
    Force user font-family in ePubs (Part 2 of 2): yes
    Ignore ePub book Adobe XPGT stylesheet (page-template.xpgt): yes

I can live without either of those patches, but in case this helps you pin down any issue (or user error is entirely possible too! ... just smack me if that's the case).