It turns out I messed up at least one thing with the massive translation-related changes in 1.1.16, so creating new sessions (which also happens when you do a fresh install) resulted in a crash preventing the program from starting. Or, well, it started if you played with the language-selection combobox, but you could do that only in the first step, when choosing the folders. Once you hit OK there was no going back unless you manually removed or changed some settings. I didn't catch it because all of my tests were on existing sessions.
Anyway, there's a new version, 1.1.17, which takes care of that issue. If you got 1.1.16, you should replace it with 1.1.17.