After creating a deployment archive and installing it on the server the theming of the project is resetted to an old version. When i deleted the gz files in the folder web, the theme is restored correctly. Which setting in Mendix should i change to let Mendix automaticcaly create the correct gz files?
This was a bug in 188.8.131.52 and has been fixed since Mendix version 2.5.2.
To prevent this, I always make sure to include .gz versions of my index.html and login.html files in every theme. I use 7-Zip to create these. As long as the index / login files are the same both in and outside of the .gz archive, there shouldn't be a problem