The f.lux team has released version 37.2 of f.lux, the automatic screen color management utility to fix a battery drain issue and flashing when in “movie mode” on some machines. The update also adds support for “big latitudes” where the sun doesn’t set or rise on some days, plus a Check for Updates button. For those using OS X 10.11 El Capitan who are experiencing colors left behind after the upgrade (when automatic brightness is enabled), the f.lux team has released version 37.3. (Free, 1.8 MB, release notes, 10.7+)
This is f.lux 37.2 There is no 37.3 edition, yet
Yes, there is - read down in the release notes, since they apparently haven't made it more official than that.