Query log is broken until Simple DNSCrypt is restarted

The Simple DNSCrypt GUI was opened during the installation. I went through the settings, enabled the proxy, and enabled the query log. But nothing appeared in the query log at all, even though entries was being added to the log file on disk. It kept saying something like "waiting for queries".

Closing the GUI (also from tray) and restarting it fixed the issue, and queries immediately appeared in the log. So it seems like there is some kind of first-run problem here.