First, thanks for making a super application - it works very well.
I can't seem to solve an issue - using Challenger Viewer, I can sync OPDS-COMICS from Ubooquity however for some reason if a folder on the server contains more than 20 comics, Challenger Viewer will only group them into clusters of 20 per thumbnail - then will begin creating additional groups of 20 in a new generically titled "Comics" thumbnail rather than using metadata names.
Web viewing works just fine - not sure if this is an Ubooquity question or a Challenger question?
Aside from this little frustration, Ubooquity works very well as a home-based book server!
Customer support service by UserEcho