Yes, I use the deb-files from weekly-ppa. I used the install from otter-browser_0.9.07-dev79-1~utopic~ppa1_amd64.deb before and after the dist-upgrade without problem. Yesterday morning Otter worked, yesterday afternoon Otter suddenly didn't work anymore.
I checked the log files against Otter's cache. As for the upgrade of openssl/libssl1.0.0 Otter still worked after that. I also purged an old kernel which I had not used since 2014 and Otter still worked after that.
The only other thing I did was add the "save"-icon to Otter's navigation bar. It might be that after the next time I started Otter it didn't work anymore. But I am not sure about that and it doesn't make sense as a fresh install of Otter doesn't solve the problem.
Currently there are no qt-updates available for testing (and Otter did work with the qt-packages installed).
Console gives:
Warning: QSqlDatabase: QSQLITE driver not loaded ((null):0, (null))
Warning: QSqlDatabase: available drivers: ((null):0, (null))
Warning: QSqlQuery::exec: database not open ((null):0, (null))
Warning: QSqlQuery::exec: database not open ((null):0, (null))
Warning: QSqlQuery::exec: database not open ((null):0, (null))
Warning: QSqlQuery::exec: database not open ((null):0, (null))
Warning: QSqlQuery::exec: database not open ((null):0, (null))
Warning: QObject::connect: Cannot connect (null)::subWindowActivated(QMdiSubWindow*) to Otter::WorkspaceWidget::activeSubWindowChanged(QMdiSubWindow*) ((null):0, (null))