I’m not sure, but I noticed, that YaCy somehow overwrites the config file while running. The safest way seems to edit the config while the instance is down and then start it again.
Hello, I can confirm this, it’s the same for me.
As a workaround, I use “Do not load URLs with an unsupported file extension” in the “Advanced Crawler”. Unfortunately the settings are also ignored by the “Autocrawler” and “shallow crawl”, so these features are useless for me, as the queue is very quickly clogged with mp3, mp4, tgz and so on.