I have also tried to create monolingual dictionaries, to no avail. See
https://www.mobileread.com/forums/sh...d.php?t=343664. Maybe you’d like to participate on GitHub.
The most likely reason for the blank pages in your case seems to be that you create v7 dictionaries, while the Tolino can only handle v6 dictionaries (which are more inefficient and much larger).
You should be able to convert v7 to v6, though. Have a look at the
genv6.sh script.