A strange one. I installed Zibra desktop on one PC - works fine offline, syncs up when online, etc.
Installed on another PC, I get
"This document cannot be displayed while offline. To go online, uncheck Work Offline from the File menu"
when starting the desktop offline. Just can't see what I've done differently. I can start up via Firefox, though, by pointing at localhost:7633, so the background process is running ...