I run Privoxy (currently version 3.0.8) under Windows 10 Creators Update 1703/15063.608 (which helps to stop malware reaching my machine by preventing websites from serving un-vetted 3-party advertising/etc for random places on the web w/o my knowledge or consent. I disable it temporarily when it interferes with some web page/application's operation.
For this to work, however, I have to configure it as a proxy, under Windows "Control Panel>Internet Options>Connections (tab)>Lan Settings". I check "Use a proxy server..." and "Bypass proxy server...", and either fill in the Address/Port with 127.0.0.1:8118 (which is where Privoxy listens), or I drill down to "Advanced" and fill in 127.0.0.1:8118 for all of HTTP/Secure/FTP/Socks, with or without checking "Use the same protocol...".
Invariably, some random time later, all of this configuration is erased, blanked out. I have to re-enter it all again. This happens several times a day.
I run Chrome (60.0.3112.113 64-bit) and Firefox (55.0.3 64-bit).
Under the assumption I have some sort of malware running amok, I have been scanning daily with AVG Free and MalwareBytes. Neither of these find anything.
Any suggestions? This only started a few weeks ago, after installing Creators Update. I did not notice it immediately, so tracking down when I might have installed some application that might be the culprit could be difficult.