It’s hard to tell without having access to a log.
Using Main Menu -> “Submit feedback” allows us to see the log.
If you want to have a look at the log your self directly:
Put Paratext Lite into Debug mode:
- Main Menu -> About
- Hit the About box 7 times.
- Main Menu -> Debug -> View Trace Log.
(and you have to scroll to the bottom to see the most recent info)
Looking for and exception message or stack trace might show what’s going on…