Hi Pascal,
Recently upgraded to 7.7.2 from 7.6 and getting UI freeze on MacOSX when
I try to open existing databases.
I also experienced this issue once or twice but wasn't exactly able to reproduce it on purpose. Your report simply tells me that there's indeed an issue with 7.7.2/ 7.7.3 and we should take a closer look at it - thanks for the report. Do you also experience the same freezes with the latest stable snapshot (7.8)?
When opening from the interactie command prompt, I get a message that the format has changed and I need to rebuild indexes.
I would serialize the database content to disk with 7.6 and create new databases from the exported files. Between version 7.7.2/7.7.3/7.8 the database format changes again - another reason to consider giving version 7.8 a go.
Sorry for not being of too much help here ...
Cheers, Lukas